A new hot spring retreat with aufguss and natural hot spring pools
Yamanashi Uenohara City
Located in Uenohara, Shin Tojiba Akiyama Onsen is a health spa that combines traditional Japanese onsen toji practices with German-style thermal therapy. Its popular "lukewarm" bath uses a 36°C simple alkaline natural hot spring delivered as a free-flowing source without reheating or dilution. The facility offers a steam sauna for men and a dry sauna for women, and it regularly holds tent sauna sessions and authentic aufguss events. A hot spring water pool area where swimsuits are required is also available, making the facility enjoyable for families as well as sauna enthusiasts.
Typeindoor
A free-flowing lukewarm bath using a 36°C simple alkaline hot spring, used as-is without reheating or dilution. Because the temperature is close to body temperature, it places less strain on the heart and allows for long, relaxed soaks.
Typeindoor
All pools, including a 25m pool and outdoor pools, use hot spring water. These swimsuit-required areas are ideal for health promotion and water walking.
Sauna TypeSteam Sauna
Capacity8people
A steam sauna located in the men's bathing area. The enveloping steam allows gradual, comfortable sweating and is gentle on the skin.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity8people
A dry sauna installed in the women's bathing area. It provides strong, sustained heat for a thorough sweat.
Water Qualitytap
Capacity3people
A compact cold plunge bath located right next to the sauna room. It refreshes and tightens the body after heating.
Closed Days: Monday
2210 Akiyama, Uenohara, Yamanashi 401-0201, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
A new hot spring retreat with aufguss and natural hot spring pools
Yamanashi Uenohara City
Located in Uenohara, Shin Tojiba Akiyama Onsen is a health spa that combines traditional Japanese onsen toji practices with German-style thermal therapy. Its popular "lukewarm" bath uses a 36°C simple alkaline natural hot spring delivered as a free-flowing source without reheating or dilution. The facility offers a steam sauna for men and a dry sauna for women, and it regularly holds tent sauna sessions and authentic aufguss events. A hot spring water pool area where swimsuits are required is also available, making the facility enjoyable for families as well as sauna enthusiasts.
Typeindoor
A free-flowing lukewarm bath using a 36°C simple alkaline hot spring, used as-is without reheating or dilution. Because the temperature is close to body temperature, it places less strain on the heart and allows for long, relaxed soaks.
Typeindoor
All pools, including a 25m pool and outdoor pools, use hot spring water. These swimsuit-required areas are ideal for health promotion and water walking.
Sauna TypeSteam Sauna
Capacity8people
A steam sauna located in the men's bathing area. The enveloping steam allows gradual, comfortable sweating and is gentle on the skin.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity8people
A dry sauna installed in the women's bathing area. It provides strong, sustained heat for a thorough sweat.
Water Qualitytap
Capacity3people
A compact cold plunge bath located right next to the sauna room. It refreshes and tightens the body after heating.
Closed Days: Monday
2210 Akiyama, Uenohara, Yamanashi 401-0201, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more