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Hot Springs for Fatigue Recovery | All 10 Spring Types

Published May 6, 2026·1min read

Fatigue recovery and health promotion are general bathing indications recognised across all 10 Japanese hot spring types, from simple springs to radioactive springs. Three physical mechanisms — thermal, hydrostatic, and buoyancy — are thought to work together to flush metabolic waste, reduce swelling, and relax muscles regardless of mineral content.

Hot Springs for Fatigue Recovery | All 10 Spring Types
Applicable spring types
10 types
Analysis records
368 records
Table of Contents
  1. Spring types indicated for fatigue recovery
  2. How onsen bathing fights fatigue
  3. Optimal bathing technique for recovery

Spring types indicated for fatigue recovery

Fatigue recovery and health promotion are general indications shared by every spring type. Every spring type is listed, but for specific goals these types are popular choices.

strong heat retention — ideal for muscle fatigue after exercise

said to boost peripheral blood flow; a common choice for sluggishness and swelling

circulation and calming effects for chronic tiredness

gentle and easy to enter even when you are run down

See the full 10-spring-type guide

How onsen bathing fights fatigue

Three universal mechanisms active in every spring type work together to restore energy:

  • Thermal effect: Raised body temperature dilates blood vessels, accelerating removal of lactic acid and other fatigue metabolitesThe warmth of the onsen water raises your core body temperature. This causes blood vessels to expand and promotes circulation, and fatigue recovery is listed among the general indications for bathing.
  • Hydrostatic pressure: Water pressure is thought to promote venous and lymphatic return and reduce oedema
  • Buoyancy: Body weight drops to about one-ninth in water, releasing stress on muscles and joints for deep relaxationWhile submerged in water, your body feels significantly lighter, weighing only about one-ninth of its normal amount. This relieves the everyday strain on your muscles and joints, allowing them to release tension and enabling a state of deep physical relaxation.

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

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Optimal bathing technique for recovery

  1. Water temperature 40–41°C, soak time 10–15 minutes as a baselineThis specific temperature range is ideal for maximizing the onsen's thermal effect. It gently raises your body temperature to dilate blood vessels and promote circulation, leaving your muscles feeling relaxed.
  2. Rest 15–30 minutes after bathing to sustain the metabolite-clearance effectThe warmth of your bath continues even after you get out of the water. Taking time to rest allows your body to cool down gradually and settle, making this post-bath pause an important part of unwinding.
  3. Avoid bathing immediately after alcohol, when very hungry, or just after a large mealBathing under these conditions can place excessive strain on your body. Soaking after consuming alcohol can cause a sharp drop in blood pressure, while bathing on an empty stomach may lead to dizziness. A bath right after a meal can interfere with digestion and strain your heart.
  4. When exhausted, start with a half-body soak (5 minutes) rather than a full immersionWhen your body is already weakened by exhaustion, a full immersion in hot water can be overly strenuous. A shorter, five-minute half-body bath (hanshin-yoku) reduces the hydrostatic pressure and thermal load on your heart and lungs, offering a gentler path to recovery.

Related Onsen Facilities

40 matches
Ohara Onsen Seryo Simple Spring
Simple SpringInfo pending
Ohara Onsen Seryo
大原温泉 芹生
Kyoto Sakyo Ward, Kyoto· 大原温泉
Skin-Beautifying Spring of Kyoto's Mountain Village

Opened in 2004, Ohara Onsen in Kyoto's Ohara district offers a colorless, transparent spring nestled in a mountain village near renowned temples like Sanzen-in and Jakkō-in. Its signature feature is a gentle, soft texture that delicately envelops the skin. Immersing yourself in this weakly alkaline, smooth water amidst the ancient capital's tranquility will slowly release tension from your stiff body and mind. This onsen is perfect for those seeking serene moments surrounded by abundant nature, far from the daily hustle.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
TEMP26℃
0℃50℃100℃
KEY MINERALS
8.2 mg/kg

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

Softens dead skin cells for a silky bathing feel.

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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Oshima Onsen Hotel Simple Spring
Simple SpringInfo pending
Oshima Onsen Hotel
大島温泉ホテル
Tokyo Oshima Town· 三原山温泉 5号井
Mt. Mihara Volcanic Spring

Miharayama Onsen Well No. 5 draws groundwater heated by the still-active Mt. Mihara from roughly 300 m underground. Although it surfaces at over 84°C, its chemistry is gentle: clear, faintly bitter water that wraps the skin softly. Steeping here while gazing across the volcanic island's lava fields suits travelers who want to let the fatigue of a day of island hiking linger away.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.9
0714
TEMP84.2℃
0℃50℃100℃
KEY MINERALS
38.5 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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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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Shotokuji Onsen Hatsuhana Simple Spring
Simple SpringInfo pending
Shotokuji Onsen Hatsuhana
はつはな
Kanagawa Yamanashi City· 正徳寺温泉 初花Hakone Onsen
Silky skin bath

Nestled in a tranquil Yamanashi City village, Shotokuji Onsen is a simple, therapeutic hot spring, cherished by locals for generations. Its highly alkaline waters, boasting a pH of 9.5, offer a thick, serum-like texture. As you slowly immerse yourself in the lukewarm bath, daily stiffness gently melts away, offering deep relaxation and potential pain relief. After your soak, anticipate surprisingly silky skin and a renewed sense of rejuvenation, perfect for those seeking an escape from the hustle to indulge in self-care.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Alkaline9.5
0714
TEMP32.2℃
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.

60.1 mg/kg

Slightly alkaline, softening dead skin cells.

1.0 mg/kg

A trace antibacterial component that keeps skin clean.

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Yumoto Hakkin Onsen Hotel Sulphate Spring
Sulphate SpringChloride SpringInfo pending
Yumoto Hakkin Onsen Hotel
湯元白金温泉ホテル
Hokkaido Biei, Kamikawa District· 白金温泉(白金14号・15号・18号・19号混合)
Cane-Forgetting Waters of the Shirogane Gorge

Shirogane Onsen began in 1950 when drilling in Biei struck scalding water, and the mayor of the day is said to have likened it to precious platinum rising from the earth, giving the spa its name. This source blends four wells, No. 14, 15, 18 and 19, in the national forest of the Shirogane district and supplies inns along the Biei River gorge. In the tub it turns a cloudy yellow-green, first slippery and then slightly squeaky on the skin, and it has long been called the "cane-forgetting spring," suiting those who want to warm to the core beside the sound of the gorge.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7
0714
TEMP51.7℃
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.

16.4 mg/kg

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

Softens dead skin cells for a silky bathing feel.

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Onsen Ryokan Yumoto Chloride Spring
Chloride SpringInfo pending
Onsen Ryokan Yumoto
温泉旅館ゆもと
Akita Oga· 湯本温泉Oga Onsen-go
Oga's Ancient Hot Salt Spring

Temple records say this spring has flowed for more than 600 years, and the lords of the Akita domain and the travel writer Sugae Masumi are said to have bathed here. Travertine thousands of years old has been found nearby. Rich in sodium (1,794 mg), chloride (2,970 mg), calcium (318.9 mg) and bicarbonate (996.3 mg), it builds mineral crust on the tub edges. It is like a seasoned master of the old healing-bath tradition.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7
0714
TEMP53.5℃
0℃50℃100℃
KEY MINERALS
52.9 mg/kg

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

Softens dead skin cells for a silky bathing feel.

2970 mg/kg

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

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Kappo Ryokan Wakamatsu Chloride Spring
Chloride SpringInfo pending
Kappo Ryokan Wakamatsu
割烹旅館 若松
Hokkaido Hakodate· 湯川温泉 若松自家源泉
Strait-View Gushing Spring

Said to have been bored in 1885 on the Yunokawa shore facing the Tsugaru Strait, this old spring still gushes up inside a small pavilion, where a sulfur scent hangs that the baths themselves barely hint at. A chloride water rich in calcium as well as sodium, it leaves white mineral crusts on the tub edges and a slightly salty, slippery feel on the skin.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.2
0714
TEMP58.3℃
0℃50℃100℃
KEY MINERALS
3496 mg/kg

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

Softens dead skin cells for a silky bathing feel.

16.0 mg/kg

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

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Yakumo Onsen Obokooso Carbonated Spring
Carbonated SpringChloride SpringInfo pending
Yakumo Onsen Obokooso
八雲温泉おぼこ荘
Hokkaido Yakumo, Futami District· 鉛川 第3号井 他 1 件
Carbonated Salt Waters of the Namarikawa Hills

Yakumo Onsen lies in forested hills along the Namarikawa River on the Oshima Peninsula. Water from Namarikawa Well No. 3 is rich in bicarbonate and chloride and carries over 410 mg/kg of free carbon dioxide. It carries a faint scent of iron and is concentrated enough for mineral crystals to float on the surface. Slightly salty, it warms the body to the core while leaving the skin moist and smooth, suiting those who want a long, unhurried soak in mineral-rich water to the sound of the river.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.3
0714
TEMP47.2℃
0℃50℃100℃
KEY MINERALS
47.2 mg/kg

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

1243 mg/kg

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

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

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Shikaribetsu-ko Onsen Hotel Fuusui Chloride Spring
Chloride SpringCarbonated SpringInfo pending
Shikaribetsu-ko Onsen Hotel Fuusui
然別湖畔温泉ホテル風水
Hokkaido Shikaoi· 然別湖畔温泉(源泉名 然別湖畔温泉ホテル1号井)Lake Shikaribetsu Onsen
Yellow-Green Waters on a Highland Lakeshore

Lake Shikaribetsu, at about 800 m, is Hokkaido's highest natural lake. Hot-spring rights on its shore changed hands in the 1920s and an inn opened in 1931; natural outflows were used until around 1965, after which water was drawn from drilled wells. Clear at the source, it turns a cloudy yellow-green in the tub and stains the floor brown with mineral deposits. A faint sulfur scent, an iron-tinged carbonate taste and a smooth, slippery feel mark the water, and in winter an ice-top open-air bath appears on the frozen lake.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.3
0714
TEMP53.9℃
0℃50℃100℃
KEY MINERALS
85.4 mg/kg

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.

Absorbed through the skin to gently promote peripheral circulation.

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Oyado Seri Chloride Spring
Chloride SpringInfo pending
Oyado Seri
お宿 芹
Hyogo 豊岡市· 城崎温泉 集中管理混合泉Kinosaki Onsen
The Town-Wide Salt Spring

Kinosaki Onsen's centrally managed mixed spring gathers water from several wells into a large storage tank, where its temperature is steadied before it flows through a looped pipe beneath the streets to the town's public bathhouses and inns. Managed as a shared resource by the Yushima property ward of Kinosaki, this faintly salty water wraps the body in warmth that lingers long after bathing, suiting travellers who stroll from bath to bath in yukata.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.3
0714
TEMP62.1℃
0℃50℃100℃
KEY MINERALS
70.0 Bq/kg

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

2460 mg/kg

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

8.0 mg/kg

Gentle calming action; often found alongside chloride.

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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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Biratori Onsen Yukara Chloride Spring
Chloride SpringInfo pending
Biratori Onsen Yukara
びらとり温泉 ゆから
Hokkaido Biratori· びらとり温泉
Deep Strong-Salt Spring of Nibutani

Biratori has bathed in cold mineral water since 1979, first trucking in water that seeped naturally across the river. In 2011 a 1,503 m borehole was sunk at Nibutani on the Saru River, a place that still carries Ainu culture, and tapped a new cold spring. At 12.1°C and a mildly alkaline pH 8.3, it holds 22.06 g/kg of minerals, led by 6,303 mg of sodium, 2,016 mg of calcium and 13,400 mg of chloride, close to seawater in strength. Clear, colorless and intensely salty, it feels like ancient sea water sleeping deep beneath Hokkaido.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.3
0714
TEMP12.1℃
0℃50℃100℃
KEY MINERALS
13400 mg/kg

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

11.6 mg/kg

Above 10 mg classifies the spring as an "iodine spring" — a rare type that delivers antibacterial and anti-inflammatory action through the skin.

53.1 mg/kg

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

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Irori no Oyado Hanashiki no Yu Sulphate Spring
Sulphate SpringChloride SpringInfo pending
Irori no Oyado Hanashiki no Yu
囲炉裏の御宿 花敷の湯
Gunma Nakanojo, Agatsuma District· 元の湯(花敷共有泉)
Riverside Blossom Spring

Motonoyu is the shared source of Hanashiki Onsen, welling up beside the confluence of the Shirasuna and Nagasasazawa rivers and managed by the local Iriyama Hanashiki property association. Legend says Minamoto no Yoritomo named the spa after mountain flowers reflected on the water, like a carpet of blossoms. The clear water carries a faint hint of sulfur, soothes the skin and lets warmth linger long after bathing, ideal for unhurried soaks to the sound of the mountain stream.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.9
0714
TEMP43℃
0℃50℃100℃
KEY MINERALS
12.2 mg/kg

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

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

488 mg/kg

Soothes the skin and gently improves circulation.

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Hotel Grandmere Sankai-so Chloride Spring
Chloride SpringInfo pending
Hotel Grandmere Sankai-so
ホテルグランメール山海荘
Aomori Ajigasawa Town· 鳴戸温泉
Ancient Sea Brine of Ajigasawa

Drilled at Naruto in Ajigasawa's Maito district, Naruto Onsen is described as "fossil seawater": ancient sea brine trapped underground long ago. With more than 21 g of dissolved minerals per kilogram, the pale-yellow water tastes intensely salty with a hint of bitterness, much like the sea itself. The Naruto source leaves a fine film of salt on the skin, so its warmth lingers long after the bath, making it a natural companion for anyone thawing out beside the winter Sea of Japan.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.4
0714
TEMP37.6℃
0℃50℃100℃
KEY MINERALS
12377 mg/kg

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

41.0 mg/kg

Gentle calming action; often found alongside chloride.

7776 mg/kg

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

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Motoyu Jinya Chloride Spring
Chloride SpringInfo pending
Motoyu Jinya
陣屋
Kanagawa Hadano· 鶴巻温泉 (秦野 第12号)
The Calcium-Rich Blessing of Tanzawa

Tsurumaki Onsen's non-volcanic waters, first utilized for bathing in 1889 after well water proved undrinkable, emerge from deep within the Tanzawa Mountains. This spring is a national rarity, exceptionally rich in calcium, gently enveloping the skin. Its restorative warmth penetrates the body's core, fostering deep relaxation and a lasting gentle glow post-bath. Following its history as 'Tokyo's inner parlor,' bustling with therapeutic bathers after the Odakyu Line opened in the early Showa era, it remains ideal for tranquil self-care away from urban clamor.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.7
0714
TEMP20.6℃
0℃50℃100℃
KEY MINERALS

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

539 mg/kg

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

98.4 mg/kg

Softens dead skin cells for a silky bathing feel.

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Sakura Kyuan Bekutei Rin Chloride Spring
Chloride SpringInfo pending
Sakura Kyuan Bekutei Rin
櫻休庵 別亭 凛
Kanagawa Hakone· 木賀温泉(櫻休庵 別亭 凛 使用源泉)
Shogun's Gorge Salt Spring

Kiga Onsen has long been counted among the historic Seven Hot Springs of Hakone, rising in the quiet Miyagino hills along the Haya River gorge. Said to have been presented to the Tokugawa shoguns in the Edo period, the water emerges clear at 63.9°C with a faint salty taste. Its salt wraps the skin and holds in warmth, while the weakly alkaline water feels soft. It suits grown-up travelers who want to sink quietly into a storied spring to the sound of the river.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8.5
0714
TEMP63.9℃
0℃50℃100℃
KEY MINERALS
15.0 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.

Softens dead skin cells for a silky bathing feel.

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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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Furou Fushi Onsen Ferruginous Spring
Ferruginous SpringChloride SpringInfo pending
Furou Fushi Onsen
不老ふ死温泉
Aomori Fukaura, Nishitsugaru District· 黄金崎不老不死温泉 他 1 件
Rust-Red Waters of Koganezaki

The Koganezaki Furofushi Onsen source gushed up in 1970 when a well was bored 200 meters beneath the shore of Koganezaki, and its name expresses the wish that those who rest here will neither age nor weaken. Clear at the moment it emerges, the water oxidizes into a rust-red hue as its iron meets the air, while its dense salts wrap the body and let warmth linger deep inside. It soothes travelers who want to unwind slowly while the sun sinks into the Sea of Japan.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.68
0714
TEMP53.6℃
0℃50℃100℃
KEY MINERALS
13460 mg/kg

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

1031 mg/kg

Easily absorbed through the skin, helping to relax muscle stiffness during bathing — a transdermal nutrient unique to hot springs.

45.7 mg/kg

Gentle calming action; often found alongside chloride.

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Oyado Tamaki Sulphate Spring
Sulphate SpringCarbonated SpringChloride SpringInfo pending
Oyado Tamaki
お宿 玉樹
Gunma 渋川市· 伊香保温泉 総合湯(黄金の湯)Ikaho Onsen
Golden Waters of Ikaho

Ikaho is an ancient spa praised in the Man'yoshu poetry anthology. In the Warring States era its stone-step street was laid out as a healing retreat for soldiers wounded at Nagashino, and the koma-guchi system that divides the spring water among the inns survives today. Kogane-no-yu rises clear, but its iron oxidizes in the air and tints the water tea-brown, as its golden name suggests. This neutral water rich in sulfate and bicarbonate warms the body to the core and has long been called a spring for fertility. It is a bath that carries Ikaho's history itself.

Onsen RyokanPrivate Rental BathRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP41.2℃
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.

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

Softens dead skin cells for a silky bathing feel.

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Onishi-ya Mizushouen Chloride Spring
Chloride SpringInfo pending
Onishi-ya Mizushouen
大西屋水翔苑
Hyogo 豊岡市· 城崎温泉 集中管理混合泉Kinosaki Onsen
The Town-Wide Salt Spring

Kinosaki Onsen's centrally managed mixed spring gathers water from several wells into a large storage tank, where its temperature is steadied before it flows through a looped pipe beneath the streets to the town's public bathhouses and inns. Managed as a shared resource by the Yushima property ward of Kinosaki, this faintly salty water wraps the body in warmth that lingers long after bathing, suiting travellers who stroll from bath to bath in yukata.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.3
0714
TEMP62.1℃
0℃50℃100℃
KEY MINERALS
70.0 Bq/kg

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

2460 mg/kg

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

8.0 mg/kg

Gentle calming action; often found alongside chloride.

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Kusatsu Onsen Itouyen Hotel Kusatsu Acidic Spring
Acidic SpringChloride SpringSulphate SpringInfo pending
Kusatsu Onsen Itouyen Hotel Kusatsu
草津温泉 伊東園ホテル草津
Gunma 草津町· 万代鉱
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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Shima Onsen Kashiwaya Ryokan Chloride Spring
Chloride SpringSulphate SpringInfo pending
Shima Onsen Kashiwaya Ryokan
四万温泉 柏屋旅館
Gunma Nakanojo· 四万温泉 長静館の湯・つばたやの湯-1 混合泉
Twin Springs of Shima Yamaguchi

Shima Onsen is said to take its name from healing "forty thousand ailments," and this water blends two naturally flowing sources from its Yamaguchi district in a mixing tank. Sodium (about 59 percent) and calcium (about 38 percent) lead the cations, while chloride (64 percent) and sulfate (30 percent) dominate the anions. It pairs the warmth of salt with the moist softness of sulfate, clear and easy-going at a gentle 1.42 g/kg, a quietly embracing water beside the Shima River gorge.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.5
0714
TEMP48.2℃
0℃50℃100℃
KEY MINERALS
37.2 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.

2.6 mg/kg

Gentle calming action; often found alongside chloride.

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Seifukan Radioactive Spring
Radioactive SpringChloride SpringInfo pending
Seifukan
清風館
Hiroshima Osakikamijima Town· 木江温泉
Salt Spring Above the Islands

Rising at Kinoe on Osakikamijima, an island reached only by ferry, this spring once served a public lodge loved by islanders and sea travelers. Saltier than seawater and rich in calcium with a trace of radon, it is a powerful water for those who want to warm themselves slowly while gazing over the scattered islands.

Onsen RyokanPrivate Rental BathRoom with Open-air BathTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
TEMP22.5℃
0℃50℃100℃
KEY MINERALS
15200 mg/kg

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

4440 mg/kg

Astringent action that tightens the skin and soothes flushing after bathing.

29.0 mg/kg

Gentle calming action; often found alongside chloride.

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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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Kusatsu Kan Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Kusatsu Kan
草津館
Gunma Kusatsu, Agatsuma District· 白旗源泉 他 1 件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 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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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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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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Oyado Konoha Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Oyado Konoha
木の葉
Gunma Kusatsu· わたの湯 他 1 件Kusatsu 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 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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Chomaipe Onsen Hotel Chloride Spring
Chloride SpringInfo pending
Chomaipe Onsen Hotel
長万部温泉ホテル
Hokkaido Oshamambe, Yamakoshi District· 長温R2号
Briny Gas-Field Spring

Oshamambe Onsen began when hot water gushed out during exploratory drilling for natural gas, and a town-run public bathhouse opened here in 1955. The Choon R2 source, a well bored 621 meters deep in 1991, is shared by the Oshamambe hot spring cooperative among the inns of the spa district. Its briny, sea-like water wraps the skin and lets warmth linger long after bathing, ideal for rail travelers easing into a cold southern Hokkaido night.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline8
0714
TEMP49.6℃
0℃50℃100℃
KEY MINERALS
53.1 mg/kg

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

5600 mg/kg

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

3478 mg/kg

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

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Misasa Onsen Ryokan Ohashi Radioactive Spring
Radioactive SpringChloride SpringInfo pending
Misasa Onsen Ryokan Ohashi
三朝温泉 旅館大橋
Tottori Misasa· 岩窟の湯
Misasa's Radium Spring Rising Through the Rocks

Misasa Onsen is said to have been discovered some 850 years ago when a samurai who spared a white wolf was guided to the spring in a dream, and its name is linked to the belief that "by the third morning, ailments are healed." It is known for radium springs with some of the world's highest radon levels. Gankutsu-no-Yu uses the natural rocks along the Mitoku River, and water rises on its own from the floor of each of its three tubs, sending small bubbles up around your feet.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.5
0714
TEMP62.1℃
0℃50℃100℃
KEY MINERALS
292 Bq/kg

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

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

13.0 mg/kg

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

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Nishimura-ya Hotel Shogetsutei Chloride Spring
Chloride SpringInfo pending
Nishimura-ya Hotel Shogetsutei
西村屋ホテル招月庭
Hyogo 豊岡市· 城崎温泉 集中管理混合泉Kinosaki Onsen
The Town-Wide Salt Spring

Kinosaki Onsen's centrally managed mixed spring gathers water from several wells into a large storage tank, where its temperature is steadied before it flows through a looped pipe beneath the streets to the town's public bathhouses and inns. Managed as a shared resource by the Yushima property ward of Kinosaki, this faintly salty water wraps the body in warmth that lingers long after bathing, suiting travellers who stroll from bath to bath in yukata.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral7.3
0714
TEMP62.1℃
0℃50℃100℃
KEY MINERALS
70.0 Bq/kg

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

2460 mg/kg

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

8.0 mg/kg

Gentle calming action; often found alongside chloride.

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Naganuma Onsen Iodine Containing Spring
Iodine Containing SpringChloride SpringInfo pending
Naganuma Onsen
ながぬま温泉
Hokkaido Naganuma· ながぬま温泉
Umaoi Strong Saline Spring

This spring rose in 1985 from a 1,500 m well in Naganuma, a farming town at the eastern edge of the Ishikari Plain beneath the Umaoi Hills, and was designated a national health-resort hot spring in 1988. It is a hypertonic strong saline water with over 20 g/kg of dissolved minerals, including 11.2 mg/kg of iodide and 356.2 mg/kg of metaboric acid, with a sea-like salty taste. It suits anyone wanting to warm up to the core after a day in the fields or on the park-golf course.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.6
0714
TEMP49.8℃
0℃50℃100℃
KEY MINERALS

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

12010 mg/kg

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

11.2 mg/kg

Above 10 mg classifies the spring as an "iodine spring" — a rare type that delivers antibacterial and anti-inflammatory action through the skin.

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Fukuichi Sulphate Spring
Sulphate SpringCarbonated SpringChloride SpringInfo pending
Fukuichi
福一
Gunma 渋川市· 伊香保温泉 総合湯(黄金の湯)Ikaho Onsen
Golden Waters of Ikaho

Ikaho is an ancient spa praised in the Man'yoshu poetry anthology. In the Warring States era its stone-step street was laid out as a healing retreat for soldiers wounded at Nagashino, and the koma-guchi system that divides the spring water among the inns survives today. Kogane-no-yu rises clear, but its iron oxidizes in the air and tints the water tea-brown, as its golden name suggests. This neutral water rich in sulfate and bicarbonate warms the body to the core and has long been called a spring for fertility. It is a bath that carries Ikaho's history itself.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP41.2℃
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.

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

Softens dead skin cells for a silky bathing feel.

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Unga no Yado Otaru Furukawa Chloride Spring
Chloride SpringInfo pending
Unga no Yado Otaru Furukawa
運河の宿 おたる ふる川
Hokkaido Otaru· 運河の宿 おたる ふる川
Warming Spring by the Canal

Drilled beside the Otaru Canal, lined with Meiji-era stone warehouses, this source is pumped up at 330 liters per minute. Though it emerges as a 20.5°C cold mineral spring, its chloride-rich water, once warmed, wraps the skin softly and lets warmth linger long after the bath. It suits travelers who want to steep away the chill after strolling the canal-side streets.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.5
0714
TEMP20.5℃
0℃50℃100℃
KEY MINERALS

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

937 mg/kg

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

562 mg/kg

Gentle warming effect that helps you stay warm after bathing.

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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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New Onsen Kaku Hotel Iodine Containing Spring
Iodine Containing SpringChloride SpringInfo pending
New Onsen Kaku Hotel
ニュー温泉閣ホテル
Hokkaido Toyotomi Town· 豊富温泉 温泉水タンク(R-1A号井・R-4号井・R-8号井・R-9号井・R-10号井の混合泉)
Northernmost Oil-Scented Spring

Toyotomi Onsen began in 1926, when hot water burst out with natural gas during oil exploration. A 2020 analysis of the mixed water from five wells recorded 34.2°C and pH 7.5, with sodium 4432 mg/kg, chloride 5952 mg/kg, bicarbonate 2136 mg/kg, iodide 16.1 mg/kg and metaboric acid 494.6 mg/kg, for 13.32 g/kg of dissolved solids. Pale yellow, cloudy and faintly oily in scent, it is a lukewarm yet deeply enveloping water with the steady, unpretentious character of a craftsman.

Onsen RyokanTattoo OK (public bath)
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.5
0714
TEMP34.2℃
0℃50℃100℃
KEY MINERALS

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

16.1 mg/kg

Above 10 mg classifies the spring as an "iodine spring" — a rare type that delivers antibacterial and anti-inflammatory action through the skin.

2136 mg/kg

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

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Shari Onsen Yumotokan Carbonated Spring
Carbonated SpringInfo pending
Shari Onsen Yumotokan
斜里温泉湯元館
Hokkaido Shari, Shari District· 斜里温泉
Amber Moor Waters at the Gateway to Shiretoko

The Shari Onsen source gushed from a 1,000 m borehole in 1976 beside the Shari River near the town center of Shari, the gateway to Shiretoko. Drilling began after a slope was spotted where snow melted first each spring, and the water has since been piped to local inns, a community rest house and nearby homes. Clear and pale brown like oolong tea, this moor water carries plant-derived humus, and its slippery touch leaves skin soft and smooth, gently easing the fatigue of travel.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHMildly Alkaline7.9
0714
TEMP55.5℃
0℃50℃100℃
KEY MINERALS
1063 mg/kg

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

16.4 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.

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Ryuno Yu Onsen Ferruginous Spring
Ferruginous SpringInfo pending
Ryuno Yu Onsen
龍乃湯温泉
Hokkaido Asahikawa· 龍乃湯温泉
Dragon-Dream Iron Spring

Local lore says this spring was found after a dream of the dragon god of a nearby shrine declaring that hot water lay beneath Higashiasahikawa. Clear at the wellhead, its abundant iron oxidizes in air, turning the bath an ochre hue with a distinctly squeaky, metallic feel on the skin.

Onsen Ryokan
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.4
0714
TEMP9.4℃
0℃50℃100℃
KEY MINERALS
23.2 mg/kg

An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.

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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Juhachiro Ferruginous Spring
Ferruginous SpringInfo pending
Juhachiro
十八楼
Gifu Gifu City· 岐阜市長良川温泉
Cormorant River Red Spring

Gifu-shi Nagaragawa Onsen is a city-owned source rising beside the Nagara River, famed for its cormorant fishing, at the foot of Mt. Kinka. Pumped up clear from underground, the water slowly turns yellow-brown as its iron oxidizes in the air, becoming the reddish, cloudy riverside bath the area is known for. A faint iron taste and metallic aroma reveal its rich iron content. It suits travelers who watch the cormorant boats' bonfires on a summer night, stroll the old Kawaramachi streets, then sink into a rustic, robust soak.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHNeutral6.6
0714
TEMP16.9℃
0℃50℃100℃
KEY MINERALS
45.9 Bq/kg

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

20.2 mg/kg

An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.

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

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