Recently added hot springs

  • 定山渓温泉 ぬくもりの宿 ふる川（北海道 · 塩化物泉）
  • 定山渓第一寶亭留 翠山亭（北海道 · 塩化物泉）
  • 翠山亭倶楽部定山渓大浴場（北海道 · 塩化物泉）
  • 宇奈月温泉サン柳亭（富山県 · 単純温泉）
  • 旅館　日の出温泉（山梨県 · 単純温泉）
  • ホテル一井（群馬県 · 酸性泉）

Browse by spring type

  • 単純温泉
  • 塩化物泉
  • 炭酸水素塩泉
  • 硫酸塩泉
  • 二酸化炭素泉
  • 含鉄泉
  • 硫黄泉
  • 酸性泉
  • 放射能泉
  • 含よう素泉

Browse by area

  • 群馬県
  • 栃木県
  • 長野県

Guides & Columns

  • View all columns
  • Chloride Springs: Benefits, Indications & Recommended Onsen
  • Simple Springs (Tanjun Onsen): Gentle Waters for Everyone
  • Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin
  • Sulphate Springs: "The Healing Waters" for Wounds, Skin & Digestion
  • Carbon Dioxide Springs: "The Bubble Waters" for Gentle Circulation
  • Ferruginous Springs: Iron-Rich Waters for Anemia & Unique Rust-Red Baths
  • Acidic Springs: Powerfully Antibacterial Waters for Skin Conditions
  • Iodine-Containing Springs: Non-Volcanic Rarity with Cholesterol Benefits
  • Sulphur Springs: Milky White Waters with Powerful Skin Benefits
  • Radioactive Springs: Traditional Radon Waters for Gout & Joint Conditions
  • Metasilicic Acid: The "Beauty Spring" Standard Mineral & Top 5 Onsen
  • Sodium ion: Main Effects & Top 5
  • Calcium ion: Main Effects & Top 5
  • Magnesium ion: Main Effects & Top 5
  • Iron ion: Main Effects & Top 5
  • Sulfide ion: Main Effects & Top 5
  • Bicarbonate ion: Main Effects & Top 5
  • Sulfate ion: Main Effects & Top 5
  • Chloride ion: Main Effects & Top 5
  • Fluoride ion: Main Effects & Top 5
  • Iodide ion: Main Effects & Top 5
  • Bromide ion: Main Effects & Top 5
  • Radon: Main Effects & Top 5
  • Free carbon dioxide: Main Effects & Top 5
  • Aluminum ion: Main Effects & Top 5
  • Manganese ion: Main Effects & Top 5
  • Strontium ion: Main Effects & Top 5
  • Carbonate ion: Main Effects & Top 5
  • Metaboric acid: Main Effects & Top 5
  • Free hydrogen sulfide: Main Effects & Top 5
  • Hot Springs for Cold Sensitivity | 4 Spring Types Explained
  • Peripheral Circulation Disorders & Onsen | All 10 Spring Types Indicated
  • Hot Springs for Fatigue Recovery | All 10 Spring Types
  • Hot Springs for Autonomic Disorder & Stress | Ministry-Approved Guide
  • Hot Springs for Insomnia | General Indication Across All 10 Spring Types
  • Hot Springs for Chronic Joint Pain & Neuralgia | All 10 Spring Types Including Radon
  • Rheumatoid Arthritis & Onsen | Radon Springs and the General Bathing Indication
  • Depression & Low Mood | Onsen Bathing as Complementary Therapy
  • Muscle Paralysis & Motor Stiffness | Onsen as Rehabilitation Therapy
  • Hot Springs for Beautiful Skin | Bicarbonate, Chloride & Sulfate Springs Explained
  • Hot Springs for Atopic Dermatitis | Sulfur & Acidic Springs: Benefits and Precautions
  • Psoriasis & Onsen | Acidic and Sulfur Springs Officially Indicated
  • Chronic Eczema & Onsen | Sulfur Springs for Antibacterial and Anti-inflammatory Action
  • Skin Infections (Pyoderma) & Onsen | Strong Antimicrobial Action of Acidic and Sulfur Springs
  • Hot Springs for Wound Healing | 4 Spring Types with Antiseptic & Regenerative Effects
  • Hot Spring Therapy for Mild Hypertension | All 10 Types & the Special Role of CO₂ Springs
  • Impaired Glucose Tolerance (Diabetes) & Onsen | Bathing and Drinking Indications
  • High Cholesterol & Onsen | Sulfate, Iodine & Sulfur Spring Drinking Indications
  • Poor Gastrointestinal Function & Onsen | Carbon Dioxide Springs Explained
  • Drinking Spring Water for Constipation | Chloride, Sulfate & Bicarbonate Springs
  • Gastric & Duodenal Ulcers | Bicarbonate Spring Drinking Indication Explained
  • Gastroesophageal Reflux (GERD) & Onsen | Bicarbonate Springs for Acid Neutralisation
  • Atrophic Gastritis & Onsen | Chloride Springs to Stimulate Gastric Acid
  • Biliary Dysfunction & Onsen | Sulfate Springs to Stimulate the Gallbladder
  • Iron Springs for Iron-Deficiency Anemia | Drinking & Bathing Benefits Explained
  • Hot Springs for Gout | Radon Springs (Bathing) & Bicarbonate Springs (Drinking)
  • Ankylosing Spondylitis & Onsen | Radioactive (Radon) Springs Specifically Indicated
  • Mild Asthma & Emphysema | Onsen Bathing and Respiratory Function
  • Haemorrhoid Pain & Onsen | Thermal Improvement of Anal Circulation
  • Post-Illness Recovery & Onsen | Thermal Therapy to Restore Vitality
  • Before You Bathe: Preparation & Safety Checklist | Ministry of Environment Guidelines
  • Safety During Hot Spring Bathing | Heat Stroke, Heat Shock & Soaking Time
  • Drinking Hot Spring Water (Insatsu) | What It Is, Benefits & Safety Rules
  • Hot Spring Contraindications | Conditions & Situations to Avoid Bathing
  • How Many Days for Toji? A Guide to Onsen Cure Length (Ministry of the Environment)
  • What Is an Onsen? | Japan's Hot Spring Definition & 3 Legal Conditions Explained
  • What Is Spring Type (Senshu)? | Japan's 10 Hot Spring Classifications Explained
  • What Is a Hot Spring Analysis Certificate? | Legal Requirements & How to Read It
  • What Are General Indications? | Health Benefits Common to All Hot Spring Types
  • What Are Contraindications for Onsen? | Conditions & Diseases That Prohibit Bathing
  • What Is Insatsu (Drinking Onsen Water)? | Culture, Benefits & Safety
  • What Is a 'Beauty Spring' (Bijin-no-yu)? | Why Metasilicic Acid Makes Skin Glow
  • Onsen vs. Sentō: What's the Difference? | Japan's Hot Spring Law Explained
  • Japanese Onsen Etiquette Guide | Washing, Towels & Bathing Rules
  • Onsen-Hopping Order | How to Visit Multiple Hot Springs in One Day
  • Tattoos at Japanese Onsen | Policies, Alternatives & Tips for Visitors
  • Mixed-Gender Bathing (Konyoku) in Japan | History, Rules & What to Expect
  • Private Family Baths (Kashikiri-buro) | How to Book & What to Expect
  • Onsen with Kids | Age Rules, Safety Tips & Choosing the Right Facility
  • Lake Akan Onsen: A Healing Retreat of Ainu Culture & Mystical Nature
  • Akiu Onsen: One of Japan's Three Royal Hot Springs, Loved by Samurai Lords
  • Amagase Onsen: Rustic Riverside Hot Springs for Body and Soul
  • Arima Onsen: Ancient Spa with Golden & Silver Waters, Loved by a Shogun
  • Asahidake Onsen: Heavenly Hot Springs in the "Garden of the Gods"
  • Asama Onsen: The Historic Hot Spring Retreat of Matsumoto Castle
  • Asamushi Onsen: A Seaside Hot Spring Oasis on Mutsu Bay
  • Aso Uchinomaki Onsen: A Healing Retreat in the Heart of the Aso Caldera
  • Atami Onsen: A Historic Seaside Hot Spring Resort Favored by Shoguns
  • Awara Onsen: The Relaxing Hot Spring Retreat of the Hokuriku Region
  • Beppu Onsen: Japan's Premier Hot Spring Resort with Unmatched Water Volume
  • Bessho Onsen: Shinshu's Oldest Hot Spring, a "Beauty Bath" for Silky Skin
  • Dake Onsen | Mt. Iwaki's gift: A therapeutic retreat with milky white waters
  • Dake Onsen: A Naturally Softened Acidic Spring from Mt. Adatara
  • Dogo Onsen: Japan's Oldest Hot Spring, a Retreat for Mind and Body
  • Ebino Kogen Onsen: Heavenly Hot Springs with Diverse Waters and Kirishima Views
  • Echigo-Yuzawa Onsen | The "Snow Country" stage, a spring for mind-body rejuvenation
  • Fukuji Onsen: A Tranquil Hot Spring Retreat in the Okuhida Mountains
  • Fukuroda Onsen: Beauty Waters Near Japan's Famous Fukuroda Falls
  • Furuyu Onsen: A Mountain Hot Spring for Deep Relaxation in Tepid Waters
  • Futsukaichi Onsen: Dazaifu's Historic Retreat from the Manyoshu Poems
  • Gero Onsen: A 'Beauty Spring' Among Japan's Three Great Onsen
  • Geto Onsen: A Secluded Hot Spring Sanctuary Guarded by Snow
  • Ginzan Onsen: A Timeless Spa Town with Taisho-Era Charm
  • Hachimantai Onsen-go: Heavenly Hot Springs Amidst Alpine Nature
  • Hakone Onsen: A Scenic Hot Spring Resort with Diverse Waters near Tokyo
  • Hanamaki Minami Onsenkyo: A Serene Valley of Hot Springs Loved by Poets
  • Harazuru Onsen: Fukuoka's Famed Hot Spring for "Double Beauty" Waters
  • Higashiyama Onsen: A historic valley retreat in Aizu
  • Hijiori Onsen: A Mountain Hot Spring Steeped in 1,200 Years of Healing Tradition
  • Hinagu Onsen: A 600-Year-Old Retreat Loved by Poets
  • Hirayu Onsen: The Gateway to Okuhida, Nestled in the Japan Alps
  • Hoshi Onsen: A Secluded Hot Spring Loved by Literati, with Waters Bubbling from the Floor
  • Ibusuki Onsen | Unwind in a World-Famous Natural Sand Bath
  • Iizaka Onsen | One of Oshu's Three Great Hot Springs, Loved by Basho
  • Ikaho Onsen: A Historic Spa Town with Two-Toned Waters
  • Isawa Onsen: A Soothing Alkaline Spring in Japan's Wine Country
  • Itamuro Onsen: The "Medicinal Waters of Shimotsuke" for Deep Relaxation
  • Ito Onsen: A Coastal Hot Spring Town near Tokyo with Abundant Waters
  • Jozankei Onsen: Sapporo's Hot Spring Oasis for Restorative Warmth
  • Kaike Onsen: Soothe Your Body and Soul with Healing 'Salt Waters'
  • Kakeyu Onsen: A Healing Retreat in Nagano for Mind and Body
  • Kamisuwa Onsen: A Lakeside Hot Spring Retreat with Abundant Healing Waters
  • Kannawa Onsen: Beppu's Steaming Heart of Balneotherapy
  • Kawaji Onsen: A Serene Valley Retreat for Deep Relaxation
  • Kawayu Onsen: Potent acidic waters from Hokkaido's volcanic heartland
  • Kawayu Onsen | Dig Your Own Hot Spring by the River
  • Kinosaki Onsen: A Charming Town of Seven Public Hot Springs
  • Kinugawa Onsen: A Serene Valley Retreat near Tokyo
  • Kirishima Onsen-go: Diverse Springs and Majestic Nature Loved by Ryoma Sakamoto
  • Kurokawa Onsen: A Serene Hot Spring Village for Onsen Hopping
  • Kusatsu Onsen | One of Japan's Top 3 Hot Springs, Famed for its Acidic Waters
  • Kyomachi Onsen: A Tranquil Riverside Retreat in Miyazaki
  • Manza Onsen: Heavenly Hot Springs at 1,800m with Japan's Richest Sulfur Water
  • Matsunoyama Onsen: One of Japan's Three Great Medicinal Hot Springs
  • Minakami Onsen-go: A Nature-Rich Hot Spring Resort at the Foot of Mt. Tanigawa
  • Misasa Onsen: A World-Class Radium Hot Spring for Healing and Rejuvenation
  • Myoken Onsen: A Rejuvenating Hot Spring Retreat by the Amori River
  • Myoko Onsen-go: A Mountain Resort of Seven Springs and Four Seasons
  • Nagato Yumoto Onsen: A Riverside Retreat Blending Tradition and Modern Design
  • Nagayu Onsen: Rejuvenate in a German-Style Spa Town with World-Class Carbonated Springs
  • Naruko Onsen-go: A Hot Spring Haven with 9 Water Types
  • Nasu Onsen-go | A Historic Hot Spring Retreat in the Imperial Highlands
  • Niseko Onsen-go: A Northern Paradise of Powder Snow and Diverse Hot Springs
  • Noboribetsu Onsen: The "Department Store of Hot Springs" with 9 Spring Types
  • Nozawa Onsen: A Historic Hot Spring Village with 13 Public Soto-yu Baths
  • Nyuto Onsen-go: A secluded village of seven hot springs in a beech forest
  • Obama Onsen | Japan's Hottest Spring with Stunning Sunsets over Tachibana Bay
  • Oga Onsen-go: Healing Hot Springs Amidst Namahage Lore and Sea Views
  • Ogoto Onsen: Lakeside Serenity and Skin-Beautifying Waters near Kyoto
  • Oigami Onsen: The Legendary Hot Spring of a Mountain Deity
  • Okukinu Onsen-go | Kanto's Last Hidden Hot Spring, Embraced by Untouched Nature
  • Okutsu Onsen: A Serene Retreat Known for its 'Beauty Water' and Foot-Washing Tradition
  • Osawa Onsen: A Historic Riverside Retreat Loved by a Poet
  • Oshuku Onsen: A legendary hot spring for silky skin, discovered by a warbler
  • Rendaiji Onsen: Deep Relaxation in Shimoda's Historic Retreat
  • Ryujin Onsen | One of Japan's Three Great 'Beauty Hot Springs'
  • Sakakibara Onsen: The Silky "Nanakuri Waters" Praised in Ancient Literature
  • Sakunami Onsen: Sendai's Serene Retreat for Deep Relaxation
  • Senami Onsen | Soothe Body & Mind with Sunsets and Thermal Waters
  • Shibu Onsen: A Historic Hot Spring Town with Nine Public Bathhouses
  • Lake Shikaribetsu Onsen: A Serene Hot Spring Retreat by the Sky-High Lake
  • Shima Onsen: A Legendary Hot Spring Retreat for Rejuvenation
  • Shimobe Onsen: Takeda Shingen's Secret Spa for Deep Relaxation
  • Shin-Hirayu Onsen: A Tranquil Retreat with Diverse Springs in the Okuhida Mountains
  • Shiobara Onsen-go: A Valley of Seven-Colored Springs with 1,200 Years of History
  • Shionoe Onsen: A Serene Kagawa Retreat with a Legendary Past
  • Shirahama Onsen | One of Japan's Three Ancient Spas, by Azure Seas and White Sands
  • Shirahone Onsen: A Secluded Hot Spring in Nagano with Milky White Waters
  • Shuzenji Onsen: Izu's 'Little Kyoto,' a Historic Hot Spring Loved by Writers
  • Sounkyo Onsen: A Valley Hot Spring in the Grandeur of Daisetsuzan
  • Sukayu Onsen: A Historic, Healing Hot Spring High in the Mountains
  • Takayu Onsen: The Milky-White Sulphur Hot Spring of Tohoku
  • Takeo Onsen: A 1,300-Year-Old Hot Spring for Silky Skin
  • Tamagawa Onsen: Japan's Most Acidic Spring, a Sanctuary for Balneotherapy
  • Tamatsukuri Onsen: Japan's Ancient Hot Spring for Silky Skin
  • Tawarayama Onsen: A Tranquil Retreat for Deep Relaxation & Rejuvenation
  • Togatta Onsen: Zao's Bounty, A Soothing Spring for Body and Soul
  • Togura Kamiyamada Onsen: Silky Skin Waters and Retro Charm by the Chikuma River
  • Tokachidake Onsen: Heavenly Hot Springs with Majestic Mountain Vistas
  • Totsukawa Onsen: A World Heritage Hot Spring Sanctuary with 100% Pure, Free-Flowing Waters
  • Tsuchiyu Onsen: A Village of Kokeshi Dolls and Steam, Healing with Diverse Springs
  • Tsuetate Onsen: A Historic Hot Spring Town of Steam and Carp Streamers
  • Tsukioka Onsen | Nurture Silky Skin in Emerald Green Waters
  • Tsuta Onsen: A secluded hot spring bubbling up from the forest floor
  • Unazuki Onsen: Gateway to Kurobe Gorge, Famed for Its Crystal-Clear Waters
  • Unzen Onsen: A Historic International Resort with Milky Sulfur Springs
  • Ureshino Onsen: One of Japan's Top 3 Hot Springs for Beautiful Skin
  • Wakura Onsen: A Seaside Hot Spring with a Thousand-Year History
  • Yamaga Onsen | A Historic Hot Spring for Its Abundant, Skin-Beautifying Waters
  • Yamanaka Onsen: A Valley Hot Spring Loved by Basho, Known for Pain Relief
  • Yamashiro Onsen: A Historic Hot Spring Town Loved by Rosanjin
  • Yoroushi Onsen: A secluded hot spring in nature's embrace, where owls watch over
  • Yubara Onsen: Unwind in the 'Champion of the West' Sand Bath
  • Yuda Onsen: The Legendary Hot Spring of the White Fox
  • Yufuin Onsen: A tranquil retreat of art and nature at the foot of Mt. Yufu
  • Yugawara Onsen | An Ancient "Wound-Healing" Spring Near Tokyo
  • Yuki Onsen: Hiroshima's Serene Retreat with Healing Radon Waters
  • Yumura Onsen: A Town of Silky Skin Waters and its 98°C 'Arayu' Spring
  • Yunogo Onsen: The Legendary 'Heron's Hot Spring' for Silky Skin in Okayama
  • Yunohama Onsen: Soothing Sunsets and Restorative "Waters of Warmth"
  • Yunomine Onsen: A World Heritage Hot Spring with 1,800 Years of History
  • Yunotsu Onsen: A Historic Hot Spring in a World Heritage Town
  • Zao Onsen | A Historic Hot Spring of Beauty and "Snow Monsters"

Recently added hot springs

  • 定山渓温泉 ぬくもりの宿 ふる川（北海道 · 塩化物泉）
  • 定山渓第一寶亭留 翠山亭（北海道 · 塩化物泉）
  • 翠山亭倶楽部定山渓大浴場（北海道 · 塩化物泉）
  • 宇奈月温泉サン柳亭（富山県 · 単純温泉）
  • 旅館　日の出温泉（山梨県 · 単純温泉）
  • ホテル一井（群馬県 · 酸性泉）

Browse by spring type

  • 単純温泉
  • 塩化物泉
  • 炭酸水素塩泉
  • 硫酸塩泉
  • 二酸化炭素泉
  • 含鉄泉
  • 硫黄泉
  • 酸性泉
  • 放射能泉
  • 含よう素泉

Browse by area

  • 群馬県
  • 栃木県
  • 長野県

Guides & Columns

  • View all columns
  • Chloride Springs: Benefits, Indications & Recommended Onsen
  • Simple Springs (Tanjun Onsen): Gentle Waters for Everyone
  • Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin
  • Sulphate Springs: "The Healing Waters" for Wounds, Skin & Digestion
  • Carbon Dioxide Springs: "The Bubble Waters" for Gentle Circulation
  • Ferruginous Springs: Iron-Rich Waters for Anemia & Unique Rust-Red Baths
  • Acidic Springs: Powerfully Antibacterial Waters for Skin Conditions
  • Iodine-Containing Springs: Non-Volcanic Rarity with Cholesterol Benefits
  • Sulphur Springs: Milky White Waters with Powerful Skin Benefits
  • Radioactive Springs: Traditional Radon Waters for Gout & Joint Conditions
  • Metasilicic Acid: The "Beauty Spring" Standard Mineral & Top 5 Onsen
  • Sodium ion: Main Effects & Top 5
  • Calcium ion: Main Effects & Top 5
  • Magnesium ion: Main Effects & Top 5
  • Iron ion: Main Effects & Top 5
  • Sulfide ion: Main Effects & Top 5
  • Bicarbonate ion: Main Effects & Top 5
  • Sulfate ion: Main Effects & Top 5
  • Chloride ion: Main Effects & Top 5
  • Fluoride ion: Main Effects & Top 5
  • Iodide ion: Main Effects & Top 5
  • Bromide ion: Main Effects & Top 5
  • Radon: Main Effects & Top 5
  • Free carbon dioxide: Main Effects & Top 5
  • Aluminum ion: Main Effects & Top 5
  • Manganese ion: Main Effects & Top 5
  • Strontium ion: Main Effects & Top 5
  • Carbonate ion: Main Effects & Top 5
  • Metaboric acid: Main Effects & Top 5
  • Free hydrogen sulfide: Main Effects & Top 5
  • Hot Springs for Cold Sensitivity | 4 Spring Types Explained
  • Peripheral Circulation Disorders & Onsen | All 10 Spring Types Indicated
  • Hot Springs for Fatigue Recovery | All 10 Spring Types
  • Hot Springs for Autonomic Disorder & Stress | Ministry-Approved Guide
  • Hot Springs for Insomnia | General Indication Across All 10 Spring Types
  • Hot Springs for Chronic Joint Pain & Neuralgia | All 10 Spring Types Including Radon
  • Rheumatoid Arthritis & Onsen | Radon Springs and the General Bathing Indication
  • Depression & Low Mood | Onsen Bathing as Complementary Therapy
  • Muscle Paralysis & Motor Stiffness | Onsen as Rehabilitation Therapy
  • Hot Springs for Beautiful Skin | Bicarbonate, Chloride & Sulfate Springs Explained
  • Hot Springs for Atopic Dermatitis | Sulfur & Acidic Springs: Benefits and Precautions
  • Psoriasis & Onsen | Acidic and Sulfur Springs Officially Indicated
  • Chronic Eczema & Onsen | Sulfur Springs for Antibacterial and Anti-inflammatory Action
  • Skin Infections (Pyoderma) & Onsen | Strong Antimicrobial Action of Acidic and Sulfur Springs
  • Hot Springs for Wound Healing | 4 Spring Types with Antiseptic & Regenerative Effects
  • Hot Spring Therapy for Mild Hypertension | All 10 Types & the Special Role of CO₂ Springs
  • Impaired Glucose Tolerance (Diabetes) & Onsen | Bathing and Drinking Indications
  • High Cholesterol & Onsen | Sulfate, Iodine & Sulfur Spring Drinking Indications
  • Poor Gastrointestinal Function & Onsen | Carbon Dioxide Springs Explained
  • Drinking Spring Water for Constipation | Chloride, Sulfate & Bicarbonate Springs
  • Gastric & Duodenal Ulcers | Bicarbonate Spring Drinking Indication Explained
  • Gastroesophageal Reflux (GERD) & Onsen | Bicarbonate Springs for Acid Neutralisation
  • Atrophic Gastritis & Onsen | Chloride Springs to Stimulate Gastric Acid
  • Biliary Dysfunction & Onsen | Sulfate Springs to Stimulate the Gallbladder
  • Iron Springs for Iron-Deficiency Anemia | Drinking & Bathing Benefits Explained
  • Hot Springs for Gout | Radon Springs (Bathing) & Bicarbonate Springs (Drinking)
  • Ankylosing Spondylitis & Onsen | Radioactive (Radon) Springs Specifically Indicated
  • Mild Asthma & Emphysema | Onsen Bathing and Respiratory Function
  • Haemorrhoid Pain & Onsen | Thermal Improvement of Anal Circulation
  • Post-Illness Recovery & Onsen | Thermal Therapy to Restore Vitality
  • Before You Bathe: Preparation & Safety Checklist | Ministry of Environment Guidelines
  • Safety During Hot Spring Bathing | Heat Stroke, Heat Shock & Soaking Time
  • Drinking Hot Spring Water (Insatsu) | What It Is, Benefits & Safety Rules
  • Hot Spring Contraindications | Conditions & Situations to Avoid Bathing
  • How Many Days for Toji? A Guide to Onsen Cure Length (Ministry of the Environment)
  • What Is an Onsen? | Japan's Hot Spring Definition & 3 Legal Conditions Explained
  • What Is Spring Type (Senshu)? | Japan's 10 Hot Spring Classifications Explained
  • What Is a Hot Spring Analysis Certificate? | Legal Requirements & How to Read It
  • What Are General Indications? | Health Benefits Common to All Hot Spring Types
  • What Are Contraindications for Onsen? | Conditions & Diseases That Prohibit Bathing
  • What Is Insatsu (Drinking Onsen Water)? | Culture, Benefits & Safety
  • What Is a 'Beauty Spring' (Bijin-no-yu)? | Why Metasilicic Acid Makes Skin Glow
  • Onsen vs. Sentō: What's the Difference? | Japan's Hot Spring Law Explained
  • Japanese Onsen Etiquette Guide | Washing, Towels & Bathing Rules
  • Onsen-Hopping Order | How to Visit Multiple Hot Springs in One Day
  • Tattoos at Japanese Onsen | Policies, Alternatives & Tips for Visitors
  • Mixed-Gender Bathing (Konyoku) in Japan | History, Rules & What to Expect
  • Private Family Baths (Kashikiri-buro) | How to Book & What to Expect
  • Onsen with Kids | Age Rules, Safety Tips & Choosing the Right Facility
  • Lake Akan Onsen: A Healing Retreat of Ainu Culture & Mystical Nature
  • Akiu Onsen: One of Japan's Three Royal Hot Springs, Loved by Samurai Lords
  • Amagase Onsen: Rustic Riverside Hot Springs for Body and Soul
  • Arima Onsen: Ancient Spa with Golden & Silver Waters, Loved by a Shogun
  • Asahidake Onsen: Heavenly Hot Springs in the "Garden of the Gods"
  • Asama Onsen: The Historic Hot Spring Retreat of Matsumoto Castle
  • Asamushi Onsen: A Seaside Hot Spring Oasis on Mutsu Bay
  • Aso Uchinomaki Onsen: A Healing Retreat in the Heart of the Aso Caldera
  • Atami Onsen: A Historic Seaside Hot Spring Resort Favored by Shoguns
  • Awara Onsen: The Relaxing Hot Spring Retreat of the Hokuriku Region
  • Beppu Onsen: Japan's Premier Hot Spring Resort with Unmatched Water Volume
  • Bessho Onsen: Shinshu's Oldest Hot Spring, a "Beauty Bath" for Silky Skin
  • Dake Onsen | Mt. Iwaki's gift: A therapeutic retreat with milky white waters
  • Dake Onsen: A Naturally Softened Acidic Spring from Mt. Adatara
  • Dogo Onsen: Japan's Oldest Hot Spring, a Retreat for Mind and Body
  • Ebino Kogen Onsen: Heavenly Hot Springs with Diverse Waters and Kirishima Views
  • Echigo-Yuzawa Onsen | The "Snow Country" stage, a spring for mind-body rejuvenation
  • Fukuji Onsen: A Tranquil Hot Spring Retreat in the Okuhida Mountains
  • Fukuroda Onsen: Beauty Waters Near Japan's Famous Fukuroda Falls
  • Furuyu Onsen: A Mountain Hot Spring for Deep Relaxation in Tepid Waters
  • Futsukaichi Onsen: Dazaifu's Historic Retreat from the Manyoshu Poems
  • Gero Onsen: A 'Beauty Spring' Among Japan's Three Great Onsen
  • Geto Onsen: A Secluded Hot Spring Sanctuary Guarded by Snow
  • Ginzan Onsen: A Timeless Spa Town with Taisho-Era Charm
  • Hachimantai Onsen-go: Heavenly Hot Springs Amidst Alpine Nature
  • Hakone Onsen: A Scenic Hot Spring Resort with Diverse Waters near Tokyo
  • Hanamaki Minami Onsenkyo: A Serene Valley of Hot Springs Loved by Poets
  • Harazuru Onsen: Fukuoka's Famed Hot Spring for "Double Beauty" Waters
  • Higashiyama Onsen: A historic valley retreat in Aizu
  • Hijiori Onsen: A Mountain Hot Spring Steeped in 1,200 Years of Healing Tradition
  • Hinagu Onsen: A 600-Year-Old Retreat Loved by Poets
  • Hirayu Onsen: The Gateway to Okuhida, Nestled in the Japan Alps
  • Hoshi Onsen: A Secluded Hot Spring Loved by Literati, with Waters Bubbling from the Floor
  • Ibusuki Onsen | Unwind in a World-Famous Natural Sand Bath
  • Iizaka Onsen | One of Oshu's Three Great Hot Springs, Loved by Basho
  • Ikaho Onsen: A Historic Spa Town with Two-Toned Waters
  • Isawa Onsen: A Soothing Alkaline Spring in Japan's Wine Country
  • Itamuro Onsen: The "Medicinal Waters of Shimotsuke" for Deep Relaxation
  • Ito Onsen: A Coastal Hot Spring Town near Tokyo with Abundant Waters
  • Jozankei Onsen: Sapporo's Hot Spring Oasis for Restorative Warmth
  • Kaike Onsen: Soothe Your Body and Soul with Healing 'Salt Waters'
  • Kakeyu Onsen: A Healing Retreat in Nagano for Mind and Body
  • Kamisuwa Onsen: A Lakeside Hot Spring Retreat with Abundant Healing Waters
  • Kannawa Onsen: Beppu's Steaming Heart of Balneotherapy
  • Kawaji Onsen: A Serene Valley Retreat for Deep Relaxation
  • Kawayu Onsen: Potent acidic waters from Hokkaido's volcanic heartland
  • Kawayu Onsen | Dig Your Own Hot Spring by the River
  • Kinosaki Onsen: A Charming Town of Seven Public Hot Springs
  • Kinugawa Onsen: A Serene Valley Retreat near Tokyo
  • Kirishima Onsen-go: Diverse Springs and Majestic Nature Loved by Ryoma Sakamoto
  • Kurokawa Onsen: A Serene Hot Spring Village for Onsen Hopping
  • Kusatsu Onsen | One of Japan's Top 3 Hot Springs, Famed for its Acidic Waters
  • Kyomachi Onsen: A Tranquil Riverside Retreat in Miyazaki
  • Manza Onsen: Heavenly Hot Springs at 1,800m with Japan's Richest Sulfur Water
  • Matsunoyama Onsen: One of Japan's Three Great Medicinal Hot Springs
  • Minakami Onsen-go: A Nature-Rich Hot Spring Resort at the Foot of Mt. Tanigawa
  • Misasa Onsen: A World-Class Radium Hot Spring for Healing and Rejuvenation
  • Myoken Onsen: A Rejuvenating Hot Spring Retreat by the Amori River
  • Myoko Onsen-go: A Mountain Resort of Seven Springs and Four Seasons
  • Nagato Yumoto Onsen: A Riverside Retreat Blending Tradition and Modern Design
  • Nagayu Onsen: Rejuvenate in a German-Style Spa Town with World-Class Carbonated Springs
  • Naruko Onsen-go: A Hot Spring Haven with 9 Water Types
  • Nasu Onsen-go | A Historic Hot Spring Retreat in the Imperial Highlands
  • Niseko Onsen-go: A Northern Paradise of Powder Snow and Diverse Hot Springs
  • Noboribetsu Onsen: The "Department Store of Hot Springs" with 9 Spring Types
  • Nozawa Onsen: A Historic Hot Spring Village with 13 Public Soto-yu Baths
  • Nyuto Onsen-go: A secluded village of seven hot springs in a beech forest
  • Obama Onsen | Japan's Hottest Spring with Stunning Sunsets over Tachibana Bay
  • Oga Onsen-go: Healing Hot Springs Amidst Namahage Lore and Sea Views
  • Ogoto Onsen: Lakeside Serenity and Skin-Beautifying Waters near Kyoto
  • Oigami Onsen: The Legendary Hot Spring of a Mountain Deity
  • Okukinu Onsen-go | Kanto's Last Hidden Hot Spring, Embraced by Untouched Nature
  • Okutsu Onsen: A Serene Retreat Known for its 'Beauty Water' and Foot-Washing Tradition
  • Osawa Onsen: A Historic Riverside Retreat Loved by a Poet
  • Oshuku Onsen: A legendary hot spring for silky skin, discovered by a warbler
  • Rendaiji Onsen: Deep Relaxation in Shimoda's Historic Retreat
  • Ryujin Onsen | One of Japan's Three Great 'Beauty Hot Springs'
  • Sakakibara Onsen: The Silky "Nanakuri Waters" Praised in Ancient Literature
  • Sakunami Onsen: Sendai's Serene Retreat for Deep Relaxation
  • Senami Onsen | Soothe Body & Mind with Sunsets and Thermal Waters
  • Shibu Onsen: A Historic Hot Spring Town with Nine Public Bathhouses
  • Lake Shikaribetsu Onsen: A Serene Hot Spring Retreat by the Sky-High Lake
  • Shima Onsen: A Legendary Hot Spring Retreat for Rejuvenation
  • Shimobe Onsen: Takeda Shingen's Secret Spa for Deep Relaxation
  • Shin-Hirayu Onsen: A Tranquil Retreat with Diverse Springs in the Okuhida Mountains
  • Shiobara Onsen-go: A Valley of Seven-Colored Springs with 1,200 Years of History
  • Shionoe Onsen: A Serene Kagawa Retreat with a Legendary Past
  • Shirahama Onsen | One of Japan's Three Ancient Spas, by Azure Seas and White Sands
  • Shirahone Onsen: A Secluded Hot Spring in Nagano with Milky White Waters
  • Shuzenji Onsen: Izu's 'Little Kyoto,' a Historic Hot Spring Loved by Writers
  • Sounkyo Onsen: A Valley Hot Spring in the Grandeur of Daisetsuzan
  • Sukayu Onsen: A Historic, Healing Hot Spring High in the Mountains
  • Takayu Onsen: The Milky-White Sulphur Hot Spring of Tohoku
  • Takeo Onsen: A 1,300-Year-Old Hot Spring for Silky Skin
  • Tamagawa Onsen: Japan's Most Acidic Spring, a Sanctuary for Balneotherapy
  • Tamatsukuri Onsen: Japan's Ancient Hot Spring for Silky Skin
  • Tawarayama Onsen: A Tranquil Retreat for Deep Relaxation & Rejuvenation
  • Togatta Onsen: Zao's Bounty, A Soothing Spring for Body and Soul
  • Togura Kamiyamada Onsen: Silky Skin Waters and Retro Charm by the Chikuma River
  • Tokachidake Onsen: Heavenly Hot Springs with Majestic Mountain Vistas
  • Totsukawa Onsen: A World Heritage Hot Spring Sanctuary with 100% Pure, Free-Flowing Waters
  • Tsuchiyu Onsen: A Village of Kokeshi Dolls and Steam, Healing with Diverse Springs
  • Tsuetate Onsen: A Historic Hot Spring Town of Steam and Carp Streamers
  • Tsukioka Onsen | Nurture Silky Skin in Emerald Green Waters
  • Tsuta Onsen: A secluded hot spring bubbling up from the forest floor
  • Unazuki Onsen: Gateway to Kurobe Gorge, Famed for Its Crystal-Clear Waters
  • Unzen Onsen: A Historic International Resort with Milky Sulfur Springs
  • Ureshino Onsen: One of Japan's Top 3 Hot Springs for Beautiful Skin
  • Wakura Onsen: A Seaside Hot Spring with a Thousand-Year History
  • Yamaga Onsen | A Historic Hot Spring for Its Abundant, Skin-Beautifying Waters
  • Yamanaka Onsen: A Valley Hot Spring Loved by Basho, Known for Pain Relief
  • Yamashiro Onsen: A Historic Hot Spring Town Loved by Rosanjin
  • Yoroushi Onsen: A secluded hot spring in nature's embrace, where owls watch over
  • Yubara Onsen: Unwind in the 'Champion of the West' Sand Bath
  • Yuda Onsen: The Legendary Hot Spring of the White Fox
  • Yufuin Onsen: A tranquil retreat of art and nature at the foot of Mt. Yufu
  • Yugawara Onsen | An Ancient "Wound-Healing" Spring Near Tokyo
  • Yuki Onsen: Hiroshima's Serene Retreat with Healing Radon Waters
  • Yumura Onsen: A Town of Silky Skin Waters and its 98°C 'Arayu' Spring
  • Yunogo Onsen: The Legendary 'Heron's Hot Spring' for Silky Skin in Okayama
  • Yunohama Onsen: Soothing Sunsets and Restorative "Waters of Warmth"
  • Yunomine Onsen: A World Heritage Hot Spring with 1,800 Years of History
  • Yunotsu Onsen: A Historic Hot Spring in a World Heritage Town
  • Zao Onsen | A Historic Hot Spring of Beauty and "Snow Monsters"
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