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Impaired Glucose Tolerance (Diabetes) & Onsen | Bathing and Drinking Indications

Published May 6, 2026·1min read

Impaired glucose tolerance carries a bathing indication across all 10 Japanese spring types, with bicarbonate and sulfur springs additionally recognised for drinking. Thermal improvement of insulin sensitivity and the metabolic effects of bicarbonate ions and sulfur compounds are studied mechanisms. Medical supervision is strongly recommended.

Impaired Glucose Tolerance (Diabetes) & Onsen | Bathing and Drinking Indications
Applicable spring types
10 types
Analysis records
120 records
Table of Contents
  1. Effective spring types for impaired glucose tolerance
  2. Onsen minerals involved in glucose metabolism
  3. How onsen therapy benefits glucose metabolism
  4. Tips for onsen therapy with diabetes (bathing & drinking)

Effective spring types for impaired glucose tolerance

Impaired glucose tolerance carries a bathing indication across all 10 spring types, with bicarbonate and sulfur springs additionally recognised for drinking.

indicated for both bathing and drinking; bicarbonate ions support metabolism

indicated for bathing and drinking; metabolic effects are under study

See the full 10-spring-type guide

Onsen minerals involved in glucose metabolism

Bicarbonate ionRead the mineral guide

Neutralises stomach acid and provides gentle gastrointestinal stimulation linked to metabolic improvement.

Sulfide ionRead the mineral guide

Studied for its role in glucose and lipid metabolism.

How onsen therapy benefits glucose metabolism

Impaired glucose tolerance describes reduced ability to metabolise blood sugar, including pre-diabetic states. The thermal and hydrostatic effects of onsen bathing promote circulation and may improve muscle glucose uptake. Drinking bicarbonate spring water provides mild gastrointestinal stimulation from bicarbonate ions, associated with metabolic improvements.

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

Tips for onsen therapy with diabetes (bathing & drinking)

  1. Check blood glucose before and after bathing; avoid long soaks while hypoglycaemic or on an empty stomach
  2. Aim for 38–40°C for 15–20 minutes, soaking calmly to avoid overheating
  3. Drink only at facilities licensed for bicarbonate or sulfur spring drinking, keeping to the prescribed amount
  4. Rehydrate before and after bathing, as you will sweat
  5. Diet and exercise remain the foundation; use onsen as a supplement under medical supervision

Related Onsen Facilities

40 matches
Kurobekyoukoku Unazukionsen Kurobe Simple Spring
Simple SpringInfo pending
Kurobekyoukoku Unazukionsen Kurobe
黒部峡谷・宇奈月温泉 ホテル黒部
Toyama Kurobe· 宇奈月温泉Unazuki Onsen
Pristine Piped Gorge Spring

This hot spring embodies the enduring passion of pioneers, delivered from Kuronagi Onsen in the upper reaches of the Kurobe River to Unazuki Onsen, approximately 7km downstream, after arduous wooden pipe laying construction in Taisho 12 (1923). Gushing at an abundant rate of approximately 2,000 liters per minute, its colorless and transparent waters seem to embody the pristine clarity of the gorge itself. With a soft touch that gently envelops the skin, it slowly warms the body to its core. Ideal for those seeking to unwind their mind and body, embraced by nature, at the various inns and public bathhouses throughout the town.

Onsen RyokanDay-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.2
0714
TEMP98.3
0℃50℃100℃
KEY MINERALS
6.2 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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Etabia Yufuinkinrinko Simple Spring
Simple SpringVerified
Etabia Yufuinkinrinko
ETAVIA湯布院金鱗湖
Oita Yufu· ETAVIA 湯布院金鱗湖
Kinrinko's Moisturizing Spring

This private spring gushes near Lake Kinrin in Yufuin, one of Japan's premier onsen destinations. The ETAVIA Yufuin Kinrinko Gensen is a simple hot spring, blessed by Mt. Yufu, known for being gentle and non-irritating to the skin. Within the history of Yufuin, long cherished as a health resort, this water has quietly soothed the minds and bodies of its visitors. Surrendering to the bath, you'll feel a smooth, lotion-like texture envelop your skin, allowing you to forget the hustle and bustle of daily life. It is a spring full of gentleness, recommended for those seeking a moment of peace.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.4
0714
TEMP39.9
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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Tanokura Simple Spring
Simple SpringVerified
Tanokura
旅亭 田乃倉
Oita Yufu· 田乃倉温泉Yufuin Onsen
Yufu's Silken Blessing

Gently bubbling forth in the Yufuin basin at the foot of the famed Mount Yufu, Tanokura Onsen is one of the area's many distinctive springs. This region has long been cherished as a therapeutic hot spring destination. This specific source is characterized by its silky-smooth texture, a gift of its weak alkalinity with a pH of 8.4. The water gently envelops the skin, leaving it feeling deeply moisturized after bathing. It is a tranquil spring that offers solace to those wishing to escape the hustle and bustle and unwind in a serene, natural setting.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.4
0714
TEMP51.2
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
Unazukionsen Enraku Simple Spring
Simple SpringInfo pending
Unazukionsen Enraku
宇奈月温泉 延楽
Toyama Kurobe· 宇奈月温泉Unazuki Onsen
Pristine Piped Gorge Spring

This hot spring embodies the enduring passion of pioneers, delivered from Kuronagi Onsen in the upper reaches of the Kurobe River to Unazuki Onsen, approximately 7km downstream, after arduous wooden pipe laying construction in Taisho 12 (1923). Gushing at an abundant rate of approximately 2,000 liters per minute, its colorless and transparent waters seem to embody the pristine clarity of the gorge itself. With a soft touch that gently envelops the skin, it slowly warms the body to its core. Ideal for those seeking to unwind their mind and body, embraced by nature, at the various inns and public bathhouses throughout the town.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.2
0714
TEMP98.3
0℃50℃100℃
KEY MINERALS
6.2 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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Morizaneonsen Yasuraginosato Yamakuni Simple Spring
Simple SpringInfo pending
Morizaneonsen Yasuraginosato Yamakuni
守実温泉 やすらぎの郷 やまくに
Oita Nakatsu· やすらぎの郷やまくに
The Healing Waters of Yamakuni

Once beloved by the local community as "Morizane Onsen," this spring was reborn in 2003 as "Yasuragi no Sato Yamakuni." Gushing from 1,000 meters underground at the foot of Mt. Hiko in Yamakuni, the Yasuragi no Sato Yamakuni Gensen is a gentle simple spring nurtured by the rich nature of Oku-Yabakei. Its mildly alkaline water, with a pH of 7.9, is exceptionally soft on the skin and minimally irritating, making it suitable for everyone from children to the elderly.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8
0714
TEMP31.8
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.

8.9 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").

Softens dead skin cells for a silky bathing feel.

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Jurigi Nagatake Onsen Simple Spring
Simple SpringInfo pending
Jurigi Nagatake Onsen
秋川渓谷瀬音の湯
Tokyo Akiruno· 十里木・長岳 (じゅうりぎながたけ) 温泉
Alkaline water for smooth skin

This hidden gem springs forth in Akiruno, a city in Tokyo blessed with abundant nature. Its most remarkable feature is its exceptionally high alkalinity, with a pH of 10.01, one of the highest in Japan. The water feels silky and lotion-like, and is traditionally associated with smoothing the skin. It is a gentle and soothing spring, perfect for those seeking to heal daily fatigue and refresh both mind and body.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Alkaline10.01
0714
TEMP25.9
0℃50℃100℃
KEY MINERALS
13.1 mg/kg

Gentle antibacterial action that conditions the skin.

3.0 mg/kg

A trace antibacterial component that keeps skin clean.

77.0 mg/kg

Slightly alkaline, softening dead skin cells.

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Yufuinonsen Yufuinsansuikan Simple Spring
Simple SpringVerified
Yufuinonsen Yufuinsansuikan
ゆふいん山水館
Oita Yufu· ゆふいん山水館 あさぎりの湯Yufuin Onsen
The Silky Skin Spring of the Morning Mist

As its name "Asagiri no Yu" (Morning Mist Bath) suggests, this source gushes forth in a location overlooking the Yufuin Basin's magical morning mist. It is a private source nurtured by one of Yufuin's most historic establishments, founded in 1911. The alkaline simple spring is gentle on the skin. Its abundant metasilicic acid helps to wash away old skin cells, leaving your skin feeling silky smooth. It is a renowned spring perfect for days when you wish to quietly reset your mind and body at the foot of Mt. Yufu.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.5
0714
TEMP64
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
Bansuiroufukuzumi Simple Spring
Simple SpringVerified
Bansuiroufukuzumi
萬翠楼 福住
Kanagawa Hakone· 湯本温泉 湯本 第3号Hakone Onsen
The Gentle Spring of Oku-Yumoto

Hakone Yumoto Onsen, said to have been discovered in the Nara period, is home to Yumoto Onsen No. 3. This source quietly gushes from its location in the deepest part of the area, along the Sugumo River valley. Excavated as a horizontal tunnel during the Meiji period, this naturally gushing spring yields soft, alkaline waters that gently envelop the skin. After a bath, one can expect a feeling of lightness, both in body and mind. It continues to be cherished and utilized by surrounding onsen facilities, beloved by those seeking to quietly restore their body and mind amidst abundant nature.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.9
0714
TEMP42.4
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.

Gentle antibacterial action that conditions the skin.

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Kawamotobetteigaden Simple Spring
Simple SpringInfo pending
Kawamotobetteigaden
かわもと別邸garden
Oita Yufu· かわもと別邸 garden
Yufu's Blessing, a Healing Spring

In the renowned Yufuin Onsen, nestled at the foot of Mt. Yufu, the "Kawamoto Bettei Garden Gensen" is drawn from 150 meters underground. This source was developed exclusively for a private lodging, born to provide a serene bathing experience enveloped by Yufuin's tranquil nature. The weakly alkaline water gently embraces the skin, leaving it feeling smooth after bathing. It is a special, healing spring perfect for days when you want to escape the hustle and bustle and cherish time for yourself.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8
0714
TEMP51
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
Suzuka Circuit Natural Onsen The Spa Simple Spring
Simple SpringInfo pending
Suzuka Circuit Natural Onsen The Spa
鈴鹿サーキット;クア・ガーデン
Mie Suzuka· 鈴鹿サーキット温泉
The Circuit's Soothing Spring

Nestled within the grounds of Suzuka Circuit, one of the world's premier racing courses, this unique hot spring has offered a soothing retreat to race fans and families since its 1994 opening. Its weakly alkaline waters, drawn from underground, are gentle on the skin with minimal irritation, effortlessly permeating the body. Ideal for cooling race excitement and gently refreshing an uplifted mind and body, this spring continues its legacy of healing in a renewed form since 2023, providing tranquility to all visitors.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.3
0714
TEMP44
0℃50℃100℃
KEY MINERALS

Softens dead skin cells for a silky bathing feel.

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

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

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PRIncludes affiliate links
Tounosawaonsen Motoyu Kansuirou Simple Spring
Simple SpringInfo pending
Tounosawaonsen Motoyu Kansuirou
元湯 環翠楼
Kanagawa Hakone· 湯元第37, 50, 110号混合Hakone Onsen
The Harmonious Skin-Beautifying Spring

Hakone Yumoto Onsen, the historic gateway to Hakone Onsenkyo, opened in the Nara period and flourished as the foremost of the 'Hakone Nanayu' (Seven Hot Springs of Hakone) during the Edo period. This particular hot spring vein, a pillar of the region's heritage, offers thick, soft waters that gently envelop the skin, promoting deep relaxation for both mind and body. After bathing, the wonderfully smooth skin feel provides a comforting embrace, inviting guests to forget daily hustle and bustle and indulge in self-care.

Onsen RyokanDay-use BathPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.8
0714
TEMP48.2
0℃50℃100℃
KEY MINERALS

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

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

Gentle antibacterial action that conditions the skin.

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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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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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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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Okuhida Garden Hotel Yakedake Carbonated Spring
Carbonated SpringChloride SpringInfo pending
Okuhida Garden Hotel Yakedake
奥飛騨ガーデンホテル焼岳
Gifu Takayama· 奥飛騨ガーデンホテル焼岳源泉Fukuji Onsen
Blessings of Okuhida, hot spring for beautiful skin

A blessed spring gushing forth in Okuhida Onsen-go, nestled in the heart of the Northern Alps. With a long history of healing the minds and bodies of travelers and bathers, this source is renowned as a 'silky skin spring' due to its abundant bicarbonate ions that smooth the skin. As you immerse yourself, the faint scent of hydrogen sulfide will help release you from the hustle and bustle of daily life. It is recommended for those who wish to refresh both mind and body and seek deep tranquility in nature.

Onsen RyokanPrivate Rental BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.67
0714
TEMP57.2
0℃50℃100℃
KEY MINERALS
56.6 mg/kg

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

1408 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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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
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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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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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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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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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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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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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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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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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.

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Hakoneyumotoonsen Hakone Kamon Chloride Spring
Chloride SpringSulphate SpringVerified
Hakoneyumotoonsen Hakone Kamon
箱根湯本温泉 箱根 花紋
Kanagawa Hakone· 箱根の湯 花紋
The Warming Waters of Hakone

Hakone Yumoto Onsen's history is said to date back to the Nara period, making it Hakone's oldest hot spring village. [2, 4] The Hakone no Yu Kamon source is a private spring drilled in this historic land. This sodium/calcium-chloride/sulfate spring follows in the tradition of famous waters once presented to the Shogun's family during the Edo period. [10] Its waters gently envelop the skin, providing a characteristic warmth that lingers long after bathing. It is recommended for those seeking to release mind and body in historic, nature-rich Hakone.

Onsen RyokanDay-use BathPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.3
0714
TEMP64.6
0℃50℃100℃
KEY MINERALS
46.6 mg/kg

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

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

971 mg/kg

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

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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.

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Gouraonsen Kiritani Hakonesou Acidic Spring
Acidic SpringSulphate SpringChloride SpringVerified
Gouraonsen Kiritani Hakonesou
桐谷 箱根荘
Kanagawa Hakone· 大涌谷温泉 (2号・3号線混合泉)Hakone Onsen
The Turbid Water of the Earth's Pulse

This unique created hot spring utilizes the fumaroles of Owakudani, which were formed by volcanic activity approximately 3000 years ago. In the early Showa period, Hakone Onsen Kyokyu Co., Ltd. developed this source to supply hot water to areas like Sengokuhara and Gora. The water, created by mixing volcanic gas and water, offers a distinct, tingling, and tightening sensation upon contact with the skin. The powerful energy from the earth delivers restorative warmth deep into the body, a warmth that lingers long after your bath. It is ideal for those seeking deep relaxation and rejuvenation, wishing to refresh their 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.

Check Availability & Rates
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Matsunoyamaonsen Hinanoyado Chitose Chloride Spring
Chloride SpringInfo pending
Matsunoyamaonsen Hinanoyado Chitose
松之山温泉 ひなの宿 ちとせ
Niigata Tokamachi· 鷹の湯 混合泉Matsunoyama Onsen
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 BathRoom with Open-air 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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Naraya Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Naraya
奈良屋
Gunma 草津町· 白旗源泉Kusatsu 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 RyokanPrivate Rental Bath
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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Tajimayaryokan Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Tajimayaryokan
草津温泉 田島屋旅館
Gunma Kusatsu· 湯畑源泉Kusatsu Onsen
The Cure-All Spring

The Yubatake source, naturally gushing from Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field), holds a distinguished history. During the Edo period, it was ranked as the highest-ranking Ozeki in the Onsen Banzuke, recognized alongside the Shirahata source as one of Kusatsu's two major hot springs. Its powerful, pH2 water, permeated with a sulfurous aroma, imparts a refreshing, tightening sensation upon the skin. A soak in this historic, renowned hot spring cleanses the body and mind, offering deep relaxation and rejuvenation from daily fatigue. It is a must-visit for those seeking to feel the energy of a historic hot spring and desire a complete refresh.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
0714
TEMP52.3
0℃50℃100℃
KEY MINERALS
49.1 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.

10.1 mg/kg

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

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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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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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PRIncludes affiliate links
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.

Check Availability & Rates
PRIncludes affiliate links
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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Matsunoyamaonsen Sakenoyado Tamakiya Chloride Spring
Chloride SpringInfo pending
Matsunoyamaonsen Sakenoyado Tamakiya
松之山温泉 酒の宿 玉城屋
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 RyokanRoom with Open-air 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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Hakonekowakien Tenyuu Chloride Spring
Chloride SpringVerified
Hakonekowakien Tenyuu
箱根小涌園 天悠
Kanagawa Hakone· 小涌園供給温泉Hakone Onsen
The Bountiful Spring of Kowakidani

The Kowakien Kyokyu Onsen is a steam-generated spring developed since 1949 to supply the Hakone Kowakien resort area. It utilizes geothermal heat from former fumarolic activity along the Kurumazawa stream, a tributary of the Jakotsu River, blending multiple sources and natural spring water. This source is widely distributed to the various facilities of the Hakone Kowakien resort, operated by Fujita Kanko, forming the foundation of the entire resort.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.4
0714
TEMP76.5
0℃50℃100℃
KEY MINERALS
19.5 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.

Softens dead skin cells for a silky bathing feel.

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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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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.

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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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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).