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Tap your way through symptoms, area, stay style, and water temperature. Our database of 10 spring types and therapeutic indications picks the single hot spring that fits you best.
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- 4Temperature
Browse onsens across Japan
Featured onsen town this week
Easily accessible from Tokyo, Hakone Onsen is one of Japan's most renowned hot spring areas. Known for its "20 hot springs," it boasts a remarkable variety of spring qualities, offering a new experience with every visit. Immerse yourself in its rich nature and embark on a journey of balneotherapy for deep relaxation and rejuvenation.
Kowakidani Onsen, once known as 'Kojigoku' (Small Hell) due to its fumaroles, was renamed in 1873 following Emperor Meiji's visit. This mixed spring, combining multiple sources developed since the late Meiji era, stands as one of Hakone's most iconic hot springs. Its waters envelop the skin in a comforting salt veil, delivering restorative warmth deep into the body's core. This mellow, historically rich spring is highly recommended for those seeking deep relaxation and a profound reset from daily life.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Read the latest analyses in the live viewer
Sodium bicarbonate cleanses the skin of old keratin and excess sebum, leaving skin soft and smooth. Expect beautiful skin after bathing.
See features & indications▾
※ Only at facilities permitted to serve drinking water. 200–500 mL/day recommended.
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.
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
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.
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.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
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.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
Sodium bicarbonate cleanses the skin of old keratin and excess sebum, leaving skin soft and smooth. Expect beautiful skin after bathing.
See features & indications▾
※ Only at facilities permitted to serve drinking water. 200–500 mL/day recommended.
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.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
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.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
See features & indications▾
Born in Fukuji Onsen, nestled in the mountains of Okuhida, where multiple sources merge into one. This special blend embodies the blessings of a land long cherished for its therapeutic waters. The soft, near-neutral water with a pH of 7.16 gently envelops the skin, while the high 95°C source delivers warmth to your core. This onsen is for those seeking to escape the everyday hustle, deeply relax their mind and body, and cherish themselves in a tranquil moment.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Born in Fukuji Onsen, nestled in the mountains of Okuhida, where multiple sources merge into one. This special blend embodies the blessings of a land long cherished for its therapeutic waters. The soft, near-neutral water with a pH of 7.16 gently envelops the skin, while the high 95°C source delivers warmth to your core. This onsen is for those seeking to escape the everyday hustle, deeply relax their mind and body, and cherish themselves in a tranquil moment.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
Sodium bicarbonate cleanses the skin of old keratin and excess sebum, leaving skin soft and smooth. Expect beautiful skin after bathing.
See features & indications▾
※ Only at facilities permitted to serve drinking water. 200–500 mL/day recommended.
Nestled at the foot of the Northern Alps in Okuhida Onsen-go, 'Fuku no Yu' (Spring of Fortune) is a blessed hot spring said to bring good fortune to its visitors. With a gentle, skin-friendly neutral pH of 7.2, its abundant bicarbonate ions wash away old skin cells, leaving your skin smooth to the touch. As you immerse yourself in the water, you'll feel the hustle and bustle of daily life fade away, accompanied by a faint scent of sulfur. This calm and pure spring embraces all who wish to reset their mind and body and gain new vitality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Nestled at the foot of the Northern Alps in Okuhida Onsen-go, 'Fuku no Yu' (Spring of Fortune) is a blessed hot spring said to bring good fortune to its visitors. With a gentle, skin-friendly neutral pH of 7.2, its abundant bicarbonate ions wash away old skin cells, leaving your skin smooth to the touch. As you immerse yourself in the water, you'll feel the hustle and bustle of daily life fade away, accompanied by a faint scent of sulfur. This calm and pure spring embraces all who wish to reset their mind and body and gain new vitality.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Moisturizes the skin and forms a protective barrier, producing a deeply moisturizing effect. Can also soothe inflammations and help the skin heal.
See features & indications▾
※ Only at facilities permitted to serve drinking water. 200–500 mL/day recommended.
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.
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.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
The 10 great spring types
- SIMPLE単Simple SpringGentle on everyone, the family bath
CHLORIDE塩Chloride SpringLocks in heat — the warming bath
BICARBONATE重Carbonated SpringSilky skin — the beauty bath
SULFATE硫Sulphate SpringThe healing & stroke bath
CO2炭Carbon Dioxide SpringThe heart & sparkling bubble bath
IRON鉄Ferruginous SpringReddish-brown bath for anemia
ACIDIC酸Acidic SpringSharp, strongly antibacterial
IODINE沃Iodine Containing SpringRare amber-brown spring
SULFUR黄Sulphur SpringSulphur-scented, lifestyle-disease bath
RADON放Radioactive SpringRare "cure-all" spring
Featured columns
- 塩SPRING TYPEMay 5, 2026· 2min read
Chloride Springs: Benefits, Indications & Recommended Onsen
Chloride springs (Cl⁻ as the main anion) are known as "the hot-retaining waters" because the salt coating on your skin keeps body heat from escaping after bathing. Excellent for cold sensitivity and dry skin.
- 郷famous-onsenMay 28, 2026· 2min read
Kakeyu Onsen: A Healing Retreat in Nagano for Mind and Body
Discover Kakeyu Onsen, a tranquil hot spring village in Nagano, said to have been revealed by a deer. Known as the "spring where you forget your cane," its waters are used for rehabilitation. Experience deep relaxation and pain relief on a wellness journey to restore your balance.
- SiO₂MINERALMay 5, 2026· 2min read
Metasilicic Acid: The "Beauty Spring" Standard Mineral & Top 5 Onsen
Metasilicic acid (H₂SiO₃) is a natural moisturizer also found in skincare lotions. Hot springs containing more than 50mg/kg are called "beauty springs" — leaving skin hydrated long after bathing. This is one of the therapeutic spring criteria in Japan's Mineral Spring Analysis Guideline (Table 1-1).
- 症SYMPTOMSMay 6, 2026· 1min read
Hot Springs for Cold Sensitivity | 4 Spring Types Explained
Discover which hot spring types are officially indicated for cold sensitivity and peripheral circulatory disorders, based on Japan's Ministry of the Environment guidelines. Chloride springs form a heat-retaining salt film on the skin, while carbon dioxide springs dilate blood vessels directly through the skin without stressing the heart.
- 礼ETIQUETTEMay 6, 2026· 2min read
Japanese Onsen Etiquette Guide | Washing, Towels & Bathing Rules
Japan's hot spring culture places high value on cleanliness and consideration for others. Here's everything first-time onsen visitors need to know — from the changing room to the bath.
- 単SPRING TYPEMay 5, 2026· 1min read
Simple Springs (Tanjun Onsen): Gentle Waters for Everyone
Simple springs have dissolved components below 1,000 mg/kg and a source temperature of 25°C or above. Mild and non-irritating, they are safe for all ages. Alkaline simple springs (pH 8.5+) are famous for leaving skin silky smooth.