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Drinking Spring Water for Constipation | Chloride, Sulfate & Bicarbonate Springs

Published May 6, 2026·1min read

Chloride, sulphate, and bicarbonate springs are officially recognised for drinking indications targeting constipation and reduced gastrointestinal function. Their mineral constituents act directly on the intestinal tract to stimulate peristalsis.

Drinking Spring Water for Constipation | Chloride, Sulfate & Bicarbonate Springs
Applicable spring types
2 types
Analysis records
71 records
Table of Contents
  1. Spring types effective for constipation
  2. The minerals behind the effect
  3. How to drink spring water and key precautions
  4. Combined effect of drinking and bathing

Spring types effective for constipation

Japan's Ministry of the Environment lists three spring types with drinking indications for reduced gastrointestinal function (constipation). Each type's active mineral components act directly on the intestinal tract.

Salt stimulates gastrointestinal secretion and intestinal motility — historically used as a "drinking cure"

Sulphate ions (SO₄²⁻) stimulate intestinal mucosa and promote peristalsis; sodium sulphate springs are especially noted for constipation

Bicarbonate ions (HCO₃⁻) protect gastrointestinal mucosa while normalising digestive function; also beneficial for constipation associated with acid reflux or gastritis

The minerals behind the effect

Sulfate ionRead the mineral guide

Retains water in the gut and stimulates the bowel (laxative action) — the key drinking-cure mineral for constipation.

Chloride ionRead the mineral guide

Promotes digestive secretion to aid bowel movement.

Bicarbonate ionRead the mineral guide

Protects the mucosa while regulating digestive function.

How to drink spring water and key precautions

  • Only drink at facilities that permit it; always follow facility instructionsNot all hot spring water is safe for consumption, so you must only drink from designated sources at facilities approved for 'insen' (therapeutic water drinking). These locations will provide specific instructions on dosage and frequency, which must be followed for your safety.
  • Typical guidance: ~150–200 mL per serving, 2–3 times a day, 30 minutes before mealsThis is a common recommendation for maximizing the therapeutic effects on digestion. Drinking a moderate amount on an empty stomach allows the spring's minerals to act directly on the gastrointestinal tract, helping to stimulate intestinal activity before food is introduced.
  • Start with a small amount (~50 mL) on your first attemptYour body may react unexpectedly to the high mineral content of the spring water. Starting with a small dose allows you to gauge your individual tolerance and avoid potential adverse effects like stomach upset while your system adjusts to the treatment.
  • Excessive drinking of high-sodium springs (chloride) may raise blood pressureChloride springs are effective for constipation due to their high salt content, which stimulates the digestive system. However, this same salt content can also lead to an increase in blood pressure if consumed in large quantities, so moderation is crucial.
  • Stop immediately and consult a doctor if diarrhoea or abdominal pain occursWhile the goal is to stimulate bowel movements, symptoms like diarrhoea or stomach pain indicate that the treatment may be too strong for your system. Discontinue drinking the water immediately and seek medical advice to prevent dehydration or other complications.

Combined effect of drinking and bathing

Beyond the direct intestinal action of drinking, bathing activates the parasympathetic nervous system (the relaxation response), which also supports gut motility via the autonomic nervous system. Combining rest at a hot spring resort with drinking therapy may be an effective approach for chronic constipation.

Filter on the map & mineral viewer

Filter by the relevant spring types and find onsen you like from the map or list. Compare analysis details with the mineral viewer.

Find onsen by these spring types

Related Onsen Facilities

40 matches
Hirayu no Mori Chloride Spring
Chloride SpringCarbonated SpringInfo pending
Hirayu no Mori
ひらゆの森
Gifu Hirayu, Okuhida Onsen-go, Takayama City· ひらゆの森の湯と沢水との混合泉Hirayu Onsen
Okuhida hot spring for beautiful skin and relaxation

Hirayu Onsen, nestled deep within Okuhida Onsenkyo and embraced by the Hida Mountains, is an ancient hot spring said to have been discovered by Takeda Shingen's defeated warriors. Its waters, rich in chloride and bicarbonate springs, gently refine the skin, promoting a silky skin sensation, while delivering restorative warmth deep into the body. This pleasant warmth lingers long after your bath, feeling like a blessing from the mountains. It is highly recommended for those seeking deep relaxation and a respite from daily life while admiring the Northern Alps, or for hikers wishing to soothe their weary bodies.

Onsen RyokanDay-use BathPrivate Rental BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.7
0714
TEMP67.7
0℃50℃100℃
KEY MINERALS
14.9 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

Softens dead skin cells for a silky bathing feel.

A natural moisturizer that leaves a hydrated feel on the skin.

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Jozankei Onsen Hotel Milione Chloride Spring
Chloride SpringInfo pending
Jozankei Onsen Hotel Milione
定山渓温泉 ホテルミリオーネ
Hokkaido Minami Ward, Sapporo· 定山渓温泉 ホテルミリオーネJozankei Onsen
Riverside Source

This source, naturally gushing 200 liters per minute from the Toyohira River riverbed in Jozankei Onsen town, began supplying surrounding hot spring facilities in 1997, named after its founder, Jozan Miizumi. Its colorless, clear waters, with a faint hint of sulfur, are characterized by a gentle salt veil that envelops the skin. The heat slowly penetrates to the body's core, providing restorative warmth that lingers long after bathing. It is a renowned spring offering deep relaxation for those seeking to escape daily hustle and warm their mind and body.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.85
0714
TEMP84.8
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1568 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Kusatsu Onsen Hotel Sakurai Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Kusatsu Onsen Hotel Sakurai
草津温泉 ホテル櫻井
Gunma 草津町· 万代鉱2Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Yoshiikeryokan Chloride Spring
Chloride SpringInfo pending
Yoshiikeryokan
吉池旅館
Kanagawa Hakone· 湯本温泉 台帳番号 湯本 第12、72、84、89、99、112号混合泉Hakone Onsen
Hakone's Historic Blended Spring

Nestled in the Hakone Yumoto area, Yumoto Onsen (a blend of sources No. 12, 72, 84, 89, 99, and 112) is a luxurious fusion of six distinct springs. It symbolizes the abundant water volume of Yumoto, which historically thrived as one of the ancient Hakone Seven Hot Springs. The chloride spring water, enveloping the skin like a delicate veil, delivers restorative warmth deep into the body's core. The lingering, cozy sensation after bathing gently promotes deep relaxation, easing away daily fatigue. This spring is recommended for those seeking to deeply warm their body and mind and indulge in tranquil moments.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.1
0714
TEMP63
0℃50℃100℃
KEY MINERALS
40.4 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

1570 mg/kg

Boosts after-bath warmth and warms the body from the core.

A natural moisturizer that leaves a hydrated feel on the skin.

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Sengokuharaonsen Senkyourou Acidic Spring
Acidic SpringSulphate SpringChloride SpringVerified
Sengokuharaonsen Senkyourou
仙郷楼
Kanagawa Hakone· 大涌谷温泉 蒸気造成混合泉
Owakudani's Earthly Pulse

Originating from the fumaroles of Owakudani, born from the eruption of Hakone volcano approximately 3,000 years ago, this artificially developed hot spring began to be supplied to Sengokuhara and Gora by Hakone Onsen Kyokyu Co., Ltd. in Showa 5 (1930). Its renowned milky white waters, blended with naturally gushing spring water, offer a pleasant sensation that tightens the skin and a powerful restorative warmth that penetrates deep into the body's core. After bathing, you'll feel surprisingly refreshed and light. It's a perfect companion when you seek to feel the Earth's energy and achieve deep relaxation and rejuvenation for your mind and body.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP60.6
0℃50℃100℃
KEY MINERALS
7.5 mg/kg

Tightens the skin and balances sebum.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

14.2 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

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Eienue Intakonchinentarubeppurizotoandosupa Chloride Spring
Chloride SpringVerified
Eienue Intakonchinentarubeppurizotoandosupa
ANAインターコンチネンタル別府リゾート&スパ
Oita Beppu· ANAインターコンチネンタル別府リゾート&スパ 浴場 壺湯Kannawa Onsen
The Soothing Spring of the Steam-Veiled Highlands

This ANA InterContinental Beppu Resort & Spa Tsuboyu Gensen source was developed using modern drilling techniques on a highland overlooking the historic, steam-filled streets of Kannawa, Beppu, a renowned therapeutic bathing area since the Kamakura period. A key feature is the dissolved salt, which gently envelops the skin to provide long-lasting warmth after bathing. It offers a moment of deep release for those seeking to connect with Beppu's magnificent nature.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.5
0714
TEMP44.3
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

19.7 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

609 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Ogawa Onsen Chloride Spring
Chloride SpringCarbonated SpringInfo pending
Ogawa Onsen
小川温泉元湯 ホテルおがわ
Toyama Asahi, Shimoniikawa District· 小川温泉
Hot Spring of Gentleness

Nestled quietly in the mountainous region of Toyama Prefecture, Ogawa Onsen gushes forth. This naturally gushing spring, cherished by locals for generations, delivers the pure blessings of the earth. Its mild, neutral waters gently embrace the body, while a subtle veil of salt ensures a restorative warmth that lingers. Guests will also experience the benefit of silky skin, feeling remarkably light and refreshed after their soak. It is highly recommended for those seeking deep relaxation from daily fatigue, and those desiring gentle comfort for cold sensitivity or gastrointestinal discomfort.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
TEMP53.5
0℃50℃100℃
KEY MINERALS
21.4 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer that leaves a hydrated feel on the skin.

Softens dead skin cells for a silky bathing feel.

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An Bar Yufu Inn Chloride Spring
Chloride SpringCarbonated SpringInfo pending
An Bar Yufu Inn
AMBER Yufuin
Oita Yufu· AMBER Yufuin
The Amber Moisture Spring

This is a newly drilled source in the Yufuin Onsen area, which boasts one of the largest outputs in Japan. Nestled at the foot of Mt. Yufu, this hot spring resort has long been cherished for therapeutic bathing. The AMBER Yufuin source features a high alkalinity of pH 8.9, combining the qualities of a bicarbonate spring that smooths the skin by removing old keratin, and a chloride spring that helps retain body heat. It is particularly characterized by its abundance of metasilicic acid, a natural moisturizing component.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.9
0714
TEMP68.1
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

A trace component with gentle antibacterial and anti-inflammatory action.

Softens dead skin cells for a silky bathing feel.

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PRIncludes affiliate links
Kamenoihoteru Kusatsurizoto Acidic Spring
Acidic SpringChloride SpringSulphate SpringInfo pending
Kamenoihoteru Kusatsurizoto
草津温泉ホテルリゾート
Gunma Kusatsu· 万代鉱Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Bourou NOGUCHI Noboribetsu Sulphur Spring
Sulphur SpringChloride SpringSulphate SpringInfo pending
Bourou NOGUCHI Noboribetsu
望楼NOGUCHI登別
Hokkaido Noboribetsu City· 奥の湯Noboribetsu Onsen
Sophisticated Adult Retreat

A new 'Wa-modern' current emerged in Noboribetsu Onsen's history in 2006. This distinctive spring, with its faintly fragrant sulfur, evokes a sense of travel, while its chloride and sulfate composition gently infuses the skin with rich warmth. The heat gradually permeates the body's core, offering a pleasant restorative warmth that endures post-bath. It is perfectly suited for those desiring deep relaxation for mind and body in a sophisticated ambiance, far from daily clamor.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHAcidic5.7
0714
TEMP46.1
0℃50℃100℃
KEY MINERALS
64.1 mg/kg

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Yuusainoyado Boukai Carbonated Spring
Carbonated SpringChloride SpringVerified
Yuusainoyado Boukai
悠彩の宿 望海
Oita Beppu· 悠彩の宿 望海 本館Beppu Onsen
The Seaside Spring of Silky Skin

This private source gushes in the Kitahama district, part of Japan's premier onsen resort, Beppu, overlooking the bay. Located in an area that has long flourished as an entertainment district, this spring has soothed countless travelers. Combining the qualities of a bicarbonate and a chloride spring, its waters gently exfoliate the skin while a veil of salt locks in moisture. After bathing, you can enjoy a unique texture that is both silky and deeply hydrated. It is a renowned spring perfect for releasing mind and body while feeling the Beppu sea breeze.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.3
0714
TEMP56.3
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Softens dead skin cells for a silky bathing feel.

A trace component with gentle antibacterial and anti-inflammatory action.

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PRIncludes affiliate links
Jozankei Onsen Suizantei Chloride Spring
Chloride SpringVerified
Jozankei Onsen Suizantei
定山渓第一寶亭留 翠山亭
Hokkaido Minami Ward, Sapporo· 第9号・10号の混合Jozankei Onsen
Private riverbed spring

The 'Mixed Source No. 9 and 10' naturally gushes from the riverbed of the Toyohira River, which flows through Jozankei Onsen. By blending multiple private sources, this unique and rich hot spring water is created. A gentle salt veil envelops the skin, delivering warmth deep into the body's core, and a pleasant restorative warmth lingers long after bathing. This blessing from the earth is especially recommended for those seeking to release daily fatigue and experience deep relaxation.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.6
0714
TEMP76.4
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1372 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Matsunoyama Onsen Shirakawaya Chloride Spring
Chloride SpringInfo pending
Matsunoyama Onsen Shirakawaya
松之山温泉 薬湯香ル宿 白川屋
Niigata Tokamachi· 鷹の湯 混合泉
Salty hot water embracing warmth

Nestled in the scenic town of Matsuyama, this spring has long been cherished for relieving traveler fatigue, boasting robust eagle-like properties. The hypertonic chloride waters envelop the skin, smoothly expelling excess fluids and metabolic waste. The lightness after bathing and deep-penetrating warmth soothe the mind and body, freeing you from daily stress. Ideal for those with chronic stiffness or cold extremities, and perfect for weekend rejuvenation.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.8
0714
TEMP88.7
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

9514 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

35.0 mg/kg

Gentle calming action; often found alongside chloride.

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Yumoto Choza Carbonated Spring
Carbonated SpringChloride SpringInfo pending
Yumoto Choza
湯元 長座
Gifu Takayama City· 長座2号Fukuji Onsen
Okuhida's Smooth Skin Hot Spring

This blessed spring gushes from 250 meters beneath the natural splendor of Oku-Hida. The water, a blend of abundant bicarbonate ions and metasilicic acid, feels silky smooth on the skin and has long been cherished as a 'beauty spring.' After bathing, you'll notice your skin feeling moist and smooth, with a warmth that lingers from your core. This spring is a gentle companion for those seeking a moment of peace to unwind both mind and body from the hustle and bustle of daily life.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8
0714
TEMP63.1
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Softens dead skin cells for a silky bathing feel.

A trace component with gentle antibacterial and anti-inflammatory action.

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PRIncludes affiliate links
Noboribetsu Onsen Sulphur Spring
Sulphur SpringChloride SpringCarbonated SpringFerruginous SpringAcidic SpringSimple SpringInfo pending
Noboribetsu Onsen
滝乃家
Hokkaido Noboribetsu· うまの湯3Noboribetsu Onsen
Historic Noboribetsu Healing Waters

Nestled in Noboribetsu Onsen, famously called the "Department Store of Hot Springs" and rooted in the Ainu "Nupur-pet" (deeply colored river), the historic "Uma no Yu" source has flowed since Taisho 6 (1917). Its faint sulfur aroma gently unwinds the mind and body. The waters, softly enveloping the skin, warm the body to its core, providing restorative warmth that lingers. Overlooking a beautiful Japanese garden, this tranquil spring offers deep relaxation, a serene escape from daily commotion.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP62.3
0℃50℃100℃
KEY MINERALS

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

28.0 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Kusatsuonsen Ichii Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Kusatsuonsen Ichii
ホテル一井
Gunma Kusatsu· 万代鉱1Kusatsu Onsen
The Strongest Spring from the Mine

The Bandaiko source, which unexpectedly erupted from within the Bandai Sulfur Mine in 1970, now stands as Kusatsu's primary hot spring, boasting the largest output and supporting the town. Named with the wish for 'eternal prosperity' (万代), this powerful source was born in the mountains, far from the Yubatake (Kusatsu's central hot-water field). Its colorless, transparent waters deliver a stimulating tingle that awakens both mind and body, while its robust warmth permeates to the very core. This energetic spring is a perfect companion for those seeking liberation from daily routines and a crisp mental and physical rejuvenation.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.7
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Rabisuta Kusatsuhiruzu Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Rabisuta Kusatsuhiruzu
ラビスタ草津ヒルズ(共立リゾート)
Gunma Kusatsu· 万代鉱2
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Check Availability & Rates
PRIncludes affiliate links
Beppuonsen Tenkuutoubou Seikaisou Carbonated Spring
Carbonated SpringChloride SpringInfo pending
Beppuonsen Tenkuutoubou Seikaisou
別府温泉 天空湯房 清海荘
Oita Beppu· 別府温泉 清海荘内湯Beppu Onsen
The hot spring that spins Beppu's silky skin

Gushing forth in Beppu, one of Japan's premier hot spring resorts, this water has long moisturized the skin of spa-goers. With a weakly alkaline pH of 8.2, the water gently envelops the skin like a beauty serum, softening it for a smooth feel. After bathing, you'll notice a supple texture and a warmth that radiates from your core. It's a healing spring, perfect for those seeking to reset mind and body away from daily life, or for anyone concerned about dry skin.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.2
0714
TEMP52.3
0℃50℃100℃
KEY MINERALS

Softens dead skin cells for a silky bathing feel.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

A trace component with gentle antibacterial and anti-inflammatory action.

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PRIncludes affiliate links
Arimaonsen Hanakoyado Chloride Spring
Chloride SpringFerruginous SpringVerified
Arimaonsen Hanakoyado
有馬温泉 ホテル花小宿
Hyogo Kobe· 極楽泉源1Arima Onsen
The Taiko's Wish-Fulfilling Spring

Gokuraku Gensen is a source for the iconic "Kinsen" (gold spring) of Arima Onsen, one of Japan's three ancient hot springs. It was once called "Negai no Yu" (Spring of Wishes) and its history is tied to Toyotomi Hideyoshi, who had its waters channeled to his private bathhouse. The rich water, which turns a reddish-brown when exposed to air, has been cherished by therapeutic bathers for centuries. Its high salt concentration envelops the skin, providing long-lasting warmth after bathing. Steeping in this historic spring, you can feel the deep warmth that once soothed samurai warlords, offering a true escape from daily fatigue.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.94
0714
TEMP98.1
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

7930 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

4336 mg/kg

Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.

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Suizantei Club Jouzankei Chloride Spring
Chloride SpringVerified
Suizantei Club Jouzankei
翠山亭倶楽部定山渓大浴場
Hokkaido Minami Ward, Sapporo· 翠山亭倶楽部定山渓Jozankei Onsen
A Private Spring Retreat

The waters of Jozankei Onsen, Sapporo's secluded retreat opened by the mountain ascetic Miizumi Jozan, are characterized by their smooth texture that gently envelops the skin. Drawn by pump-lifted methods, these therapeutic waters create a "salt veil" that thoroughly warms the body to its core, providing restorative warmth that lingers long after your bath. It's an ideal escape for those seeking deep relaxation for mind and body, allowing one to reflect on Jozankei's pristine landscapes away from the daily hustle.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.45
0714
TEMP62
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1359 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Kujuukougenhoteru Chloride Spring
Chloride SpringSulphate SpringCarbonated SpringVerified
Kujuukougenhoteru
天空の大地 久住高原ホテル
Oita Taketa· 天空の大地 久住高原ホテル
Kuju Highland's Skin-Nourishing Spring

Pumped from 1,000 meters beneath the Kuju Highlands in Aso-Kuju National Park, the Tenku no Daichi Kuju Kogen Hotel source is a true all-star spring, combining the properties of chloride, sulfate, and bicarbonate waters. Rich in metasilicic acid, a natural moisturizer, it leaves skin feeling smooth during the bath and wonderfully soft afterward. It's perfect for days when you want to deeply soothe body and soul while gazing at the majestic nature of the Kuju mountain range and Mount Aso.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.8
0714
TEMP51.5
0℃50℃100℃
KEY MINERALS
44.6 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

1190 mg/kg

A "beauty spring" that gently emulsifies dead skin cells, leaving skin smooth after bathing.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Hakone Suishouen Chloride Spring
Chloride SpringCarbonated SpringVerified
Hakone Suishouen
箱根・翠松園
Kanagawa Hakone· 小涌谷温泉Hakone Onsen
Meiji-Era Kowakudani Spring

Kowakidani Onsen, once known as 'Kojigoku' (Small Hell) due to its fumaroles, was renamed in 1873 following Emperor Meiji's visit. This mixed spring, combining multiple sources developed since the late Meiji era, stands as one of Hakone's most iconic hot springs. Its waters envelop the skin in a comforting salt veil, delivering restorative warmth deep into the body's core. This mellow, historically rich spring is highly recommended for those seeking deep relaxation and a profound reset from daily life.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.9
0714
TEMP60
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Softens dead skin cells for a silky bathing feel.

A trace component with gentle antibacterial and anti-inflammatory action.

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Gen Hakonegoura Chloride Spring
Chloride SpringVerified
Gen Hakonegoura
玄 箱根強羅
Kanagawa Hakone· 強羅温泉 (5号・6号井混合蒸気造成泉)Hakone Onsen
The Crafted Geothermal Spring

Gora Onsen is a unique "steam-created spring," established in the early Showa period, born from the reaction between volcanic steam from Owakudani and water from Sengokuhara. This blessing embodies the fusion of Hakone's natural power and human ingenuity. A gentle salt veil envelops the skin, delivering heat deep into the body's core, ensuring restorative warmth that lingers long after your bath. It's the perfect spring to soothe the fatigue of an active day and quietly replenish your vitality for tomorrow.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.3
0714
TEMP56.2
0℃50℃100℃
KEY MINERALS
30.4 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

559 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Matsunoyama Onsen Ponshu Hotel Suimu Chloride Spring
Chloride SpringInfo pending
Matsunoyama Onsen Ponshu Hotel Suimu
松之山温泉 Ponshu Hotel 睡夢
Niigata Tokamachi· 鷹の湯 混合泉
Salty hot water embracing warmth

Nestled in the scenic town of Matsuyama, this spring has long been cherished for relieving traveler fatigue, boasting robust eagle-like properties. The hypertonic chloride waters envelop the skin, smoothly expelling excess fluids and metabolic waste. The lightness after bathing and deep-penetrating warmth soothe the mind and body, freeing you from daily stress. Ideal for those with chronic stiffness or cold extremities, and perfect for weekend rejuvenation.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.8
0714
TEMP88.7
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

9514 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

35.0 mg/kg

Gentle calming action; often found alongside chloride.

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Shogetsu Grand Hotel Chloride Spring
Chloride SpringInfo pending
Shogetsu Grand Hotel
章月グランドホテル
Hokkaido Minami Ward, Sapporo· 定山渓温泉Jozankei Onsen
Toyohira River Spring

Since its discovery in 1866 by the ascetic monk Miizumi Jozan, Jozankei Onsen has been cherished as Sapporo's secluded hot spring retreat. Its springs, naturally gushing approximately 8,600 liters per minute from the riverbed near Tsukimibashi and Takayamabashi on the Toyohira River, are colorless, clear, and possess a subtly salty taste. This water envelops the skin like a delicate veil of salt, delivering restorative warmth deep into the body's core. It is highly recommended for those seeking deep relaxation and liberation of mind and body, away from urban clamor, while immersed in the valley's changing seasons.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP77.5
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1492 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Arima Onsen Chloride Spring
Chloride SpringFerruginous SpringInfo pending
Arima Onsen
SPA TERRACE 紫翠
Hyogo Kita Ward, Kobe· 天神泉源Arima Onsen
Blessings of the Earth, Golden Hot Spring

This is a representative 'Kinsen' (golden spring) of Arima Onsen, one of Japan's three ancient hot springs. Rich in iron and salt, its waters turn a distinctive reddish-brown upon contact with air. These dense minerals provide deep, lasting warmth, while a salt veil on the skin helps retain moisture, leaving it feeling smooth. Perfect for those struggling with chronic fatigue or poor circulation, or anyone seeking to refresh mind and body. It supports those wishing to regain vitality through the power of its potent waters.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.6
0714
TEMP99.4
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

21130 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

10470 mg/kg

Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.

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Arimaonsen Kamenoihoteru Arima Ferruginous Spring
Ferruginous SpringChloride SpringInfo pending
Arimaonsen Kamenoihoteru Arima
有馬温泉 亀の井ホテル 有馬
Hyogo Kobe· 愛宕山泉源
Earth-Staining Golden Spring

The Atagoyama Sengen, gushing forth in Arima Onsen—one of Japan's three ancient hot springs—is a prime example of the "Kinsen" (gold spring), which turns a vivid reddish-brown upon contact with air. Its history is deep, having long supported the therapeutic bathing culture of Arima. The water from this source, rich in salt and iron, offers a powerful warmth that heats the body to its core. Steeping in this bath envelops you in a warmth that feels infused with the earth's blessings, a sensation that lingers long after you emerge.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.14
0714
TEMP96.6
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

30600 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

13800 mg/kg

Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.

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Nukumorino Yado Furukawa Chloride Spring
Chloride SpringVerified
Nukumorino Yado Furukawa
定山渓温泉 ぬくもりの宿 ふる川
Hokkaido Minami Ward, Sapporo· 定山渓温泉Jozankei Onsen
Toyohira River Mixed Spring

Naturally gushing from the riverbed and banks of the Toyohira River, which flows through the heart of Jozankei Onsen, this source's waters are collected without mechanical pumps. Its pristine freshness, embodying the earth's blessings, is truly captivating. A gentle, saline veil envelops the skin, delivering restorative warmth deep into the body's core, ensuring a blissful, lasting afterglow. It's an invitation for those who yearn to be embraced by nature's vigor and experience deep relaxation from the depths of their mind and body.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.2
0714
TEMP64.9
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1623 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Kusatsuonsen Bouun Acidic Spring
Acidic SpringChloride SpringSulphate SpringVerified
Kusatsuonsen Bouun
望雲
Gunma Kusatsu· 万代鉱1Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
0714
TEMP94.6
0℃50℃100℃
KEY MINERALS
43.2 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

25.1 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Yuyado Tokinoniwa Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringVerified
Yuyado Tokinoniwa
湯宿 季の庭
Gunma Kusatsu· わたの湯1Kusatsu Onsen
The Cotton-Wrapped Spring

This rare, naturally gushing source emerges from beneath 'Gensenkaku,' nestled beside Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field). Despite its strong acidity, its waters offer a remarkably soft bathing sensation, akin to being enveloped in silk floss. The milky-white waters, renowned for having Kusatsu's finest 'yunohana' (hot spring minerals), gently embrace the skin, contributing to silky skin and providing a restorative warmth that lingers deep within the body. Known as a 'phantom spring' for its history of disappearing once during the Taisho era, it now offers a profound escape from daily life, inviting deep relaxation and rejuvenation.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
0714
TEMP50.2
0℃50℃100℃
KEY MINERALS
44.3 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

9.6 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

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Jozankei Onsen Hotel Shikanoyu Chloride Spring
Chloride SpringInfo pending
Jozankei Onsen Hotel Shikanoyu
定山渓温泉ホテル鹿の湯
Hokkaido Minami Ward, Sapporo· ホテル鹿の湯5号泉、33号泉の混合泉Jozankei Onsen
Historic Deer Healing Spring

This renowned hot spring of Jozankei Onsen traces its origins to a legend from 1897, where a wild deer was said to have healed its wounds on the banks of the Toyohira River. Rich in salt, the waters gently envelop the skin like a protective veil, delivering a soothing warmth that penetrates deep into the body's core. The pleasant, lingering warmth after bathing feels akin to being embraced by nature's blessings. This source offers a serene retreat for those seeking to unwind from daily fatigue while listening to the tranquil murmuring of the valley.

Onsen RyokanTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP62.3
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

1364 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Beppuonsen Kouraku Carbonated Spring
Carbonated SpringChloride SpringInfo pending
Beppuonsen Kouraku
別府温泉 ホテル好楽
Oita Beppu· 別府温泉ホテル好楽
The Spring of Beauty and Warmth

Gushing in the Kitahama area, the heart of the Beppu Onsen region renowned for Japan's largest hot spring output, this private source has a rich history. The area flourished as an entertainment district for therapeutic bathers since a regular sea route to Osaka was established in the Meiji era. The Beppu Onsen Hotel Koraku source is uniquely characterized by its dual nature as both a bicarbonate and a chloride spring. Steeping in its waters gently exfoliates the skin while a fine veil of salt locks in moisture, leaving you with a silky feel and a restorative warmth that lingers long after your bath.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.4
0714
TEMP50.6
0℃50℃100℃
KEY MINERALS

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

Softens dead skin cells for a silky bathing feel.

A trace component with gentle antibacterial and anti-inflammatory action.

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Kumihama Onsen Yumoto Kan Chloride Spring
Chloride SpringInfo pending
Kumihama Onsen Yumoto Kan
久美浜温泉 湯元館
Kyoto Kumihama, Kyotango· 久美浜温泉(高温源泉)1
Kumihama's Warming Waters

Discovered in 1992, Kumihama Onsen, drilled from 1500m underground, emerges in the scenic Kumihama Bay area of northern Kyoto Prefecture, facing the Sea of Japan. Its colorless, transparent, and mild waters are renowned for a gentle, skin-enveloping veil of salt. This unique quality delivers restorative warmth deep into the body's core, ensuring a lasting sense of comfort long after you leave the bath. It's an ideal retreat for those seeking deep relaxation and a profound escape from daily life amidst stunning rias coastlines.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.08
0714
TEMP51.2
0℃50℃100℃
KEY MINERALS
2278 mg/kg

Boosts after-bath warmth and warms the body from the core.

10.1 mg/kg

Gentle calming action; often found alongside chloride.

889 mg/kg

Gentle astringent action that conditions the skin.

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Arimaonsen Tousen Goshobou Ferruginous Spring
Ferruginous SpringChloride SpringVerified
Arimaonsen Tousen Goshobou
陶泉 御所坊
Hyogo Kobe· 妬泉源Arima Onsen
The Golden Spring of Legend

The Uwanari Gensen is a primary source for Arima Onsen's famous "Kinsen" (Golden Spring). Its name, meaning "jealousy spring," comes from a legend that the water would gush violently with envy whenever a beautiful woman passed by. [3, 6, 7] Once an intermittent spring, it is now drilled and its waters are distributed to many establishments in Arima via other sources like the Gosho Sengen. [3, 6, 7] Rich in iron and salt, this spring is known for its characteristic reddish-brown color upon oxidation and its ability to warm the body to its core.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.7
0714
TEMP100.5
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

21980 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

10840 mg/kg

Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.

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Kusatsu Kan Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Kusatsu Kan
草津館
Gunma Kusatsu, Agatsuma District· 白旗源泉1Kusatsu Onsen
Shirahata-no-yu of Kusatsu

Shirahatage Genzen, located in Kusatsu Onsen and adjacent to Yubatake (Kusatsu's central hot-water field), is said to have been discovered by Minamoto no Yoritomo. Historically, it served as the stage for 'Jikan-yu' (timed bathing), supporting balneotherapy culture, and is truly considered the soul of Kusatsu. Its distinctive aroma and powerful waters, which feel as though they firm the skin, seem to awaken the mind and body from within. Surrendering to its embrace offers a pure moment to shed daily clamor and rediscover one's true self. This spring is a sanctuary for those seeking a fresh start and rejuvenation.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
0714
TEMP51.9
0℃50℃100℃
KEY MINERALS
47.1 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.

10.0 mg/kg

Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.

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Arimaonsen Takayamasou Hanano Radioactive Spring
Radioactive SpringSimple SpringChloride SpringInfo pending
Arimaonsen Takayamasou Hanano
有馬温泉 高山荘 華野
Hyogo Kobe· ラドン泉, 1号1
The Silver Spring of Healing

This Radon-sen No. 1 source plays a key role as one of the "Ginsen" (Silver Springs) that color the history of Arima Onsen, one of Japan's three ancient hot springs. In contrast to the reddish-brown "Kinsen" containing iron, Ginsen is characterized by its clear, smooth feel. The water from this source is said to gently stimulate cells and vitalize the body as it's absorbed through breathing.

Onsen RyokanRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.94
0714
TEMP14.6
0℃50℃100℃
KEY MINERALS
637 マッヘ単位

A rare radioactive spring where trace radiation absorbed via inhalation and skin is expected to stimulate cells (the "hormesis effect").

2.8 mg/kg

A trace antibacterial component that keeps skin clean.

A natural moisturizer that leaves a hydrated feel on the skin.

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Shikinoyuzashikimusashinobekkan Chloride Spring
Chloride SpringVerified
Shikinoyuzashikimusashinobekkan
武蔵野別館
Kanagawa Hakone· 温泉村 第114号Hakone Onsen
Warmth of the Valley Spring

Onsenmura No. 114, a chloride spring drawn from approximately 100 meters underground at Miyanoshita Onsen—one of Hakone's renowned Seven Hot Springs—carries a rich history. This area flourished as a therapeutic hot spring resort since the Edo period, evolving into an international destination during the Meiji era. The spring's unique feature is its gentle embrace, forming a 'salt veil' on the skin that slowly warms the body from its core. The restorative warmth lingers long after your bath, promoting deep relaxation for both mind and body. It is highly recommended for those seeking to soothe daily fatigue while immersing themselves in history.

Onsen RyokanPrivate Rental BathRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.1
0714
TEMP60.8
0℃50℃100℃
KEY MINERALS
22.3 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

510 mg/kg

Boosts after-bath warmth and warms the body from the core.

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Noboribetsu Onsen Acidic Spring
Acidic SpringFerruginous SpringSulphate SpringChloride SpringCarbonated SpringSulphur SpringSimple SpringVerified
Noboribetsu Onsen
第一滝本館大浴場
Hokkaido Noboribetsu· 1号甲泉2Noboribetsu Onsen
Blessings of the Earth, Powerful Acidic Spring

This is one of the most well-known sources in Noboribetsu, a leading onsen destination in Hokkaido. It continuously flows at a high temperature of 96.5°C, embodying the raw power of the earth. The highly acidic water, with a pH of 2.2, provides a tingling sensation on the skin and a refreshing feeling after bathing. Its rich iron and sulfate content offers a powerful bathing experience that feels as if it's awakening both mind and body. It's a spring for those who wish to reset from daily fatigue, gain new vitality, and feel nature's energy throughout their entire being.

Onsen RyokanRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.2
0714
TEMP96.5
0℃50℃100℃
KEY MINERALS

Undissociated boric acid with antibacterial action that keeps the skin surface clean.

16.9 mg/kg

Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.

A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.

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Hoshi Onsen Sulphate Spring
Sulphate SpringVerified
Hoshi Onsen
法師温泉長寿館
Gunma Minakami, Tone District· 法師温泉(旭の湯)Hoshi Onsen
Healing waters that mark the passage of eternal time

With a history stretching back to the Meiji era, Hoshi Onsen's "Asahi no Yu" source is a natural gift, bubbling up directly from the earth. The alkaline water, with a pH of 8.5, is gentle on the skin, while the perfect 41.5°C temperature slowly melts away physical and mental tension. The warming effects of the sulfate spring provide lasting warmth long after you leave the bath. This onsen embraces those seeking to forget daily clamor, reconnect with themselves in tranquility, and reset mind and body amidst history and nature.

Onsen RyokanDay-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.5
0714
TEMP41.5
0℃50℃100℃
KEY MINERALS

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer that leaves a hydrated feel on the skin.

660 mg/kg

Soothes the skin and gently improves circulation.

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Yujuku Onsen Sulphate Spring
Sulphate SpringInfo pending
Yujuku Onsen
湯宿温泉 金田屋
Gunma Minakami, Tone District· 窪湯(湯宿温泉)
Sulfate Healing Spring

Nestled along the Tone River, Yujuku Onsen has been a beloved hot spring in a quiet post town, cherished by travelers and literati since the Edo period. Its waters, smooth as silk, envelop the skin in a veil of moisture, offering a truly silky skin experience. This restorative warmth penetrates deep into the body's core, gently releasing daily tensions and promoting deep relaxation. It is a renowned spring for those seeking rejuvenation and a peaceful recuperation amidst the tranquil mountain scenery, with its comforting warmth lingering long after bathing.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8
0714
TEMP59.1
0℃50℃100℃
KEY MINERALS
4.1 mg/kg

A trace antibacterial component that keeps skin clean.

A trace component with gentle antibacterial and anti-inflammatory action.

A natural moisturizer that leaves a hydrated feel on the skin.

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SPRING TYPEMay 5, 2026· 2min read

Chloride Springs: Benefits, Indications & Recommended Onsen

Chloride springs (Cl⁻ as the main anion) are known as "the hot-retaining waters" because the salt coating on your skin keeps body heat from escaping after bathing. Excellent for cold sensitivity and dry skin.

Sulphate Springs: "The Healing Waters" for Wounds, Skin & Digestion
SPRING TYPEMay 5, 2026· 1min read

Sulphate Springs: "The Healing Waters" for Wounds, Skin & Digestion

Sulphate springs (SO₄²⁻ as the main anion) are called "the healing waters" for their anti-inflammatory, skin-moisturizing properties. Indicated for bathing (cuts, cold sensitivity, dry skin, depression) and drinking (biliary dysfunction, dyslipidemia, constipation).

Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin
SPRING TYPEMay 5, 2026· 2min read

Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin

Bicarbonate springs (HCO₃⁻ as the main anion) are known as "the beauty waters" because bicarbonate gently removes dead skin cells and sebum, leaving skin silky smooth. Indicated for bathing (cuts, cold sensitivity, dry skin) and drinking (gastroduodenal ulcers, diabetes, gout).

Hot Springs for Gout | Radon Springs (Bathing) & Bicarbonate Springs (Drinking)
SYMPTOMSMay 6, 2026· 1min read

Hot Springs for Gout | Radon Springs (Bathing) & Bicarbonate Springs (Drinking)

Japan's Ministry of the Environment guidelines recognise radon springs for bathing and bicarbonate springs for drinking as indicated therapies for gout and hyperuricemia. Each spring type works through different mechanisms to help manage uric acid levels.