A sanctuary for Finnish-style sauna and avanto experiences, embraced by the nature of the Tokachi River headwaters
Hokkaido Shintoku Town
Kuttari Onsen Lake Inn is a hot spring inn on the shores of Lake Kuttari in Shintoku, Hokkaido, attracting serious sauna enthusiasts. Its biggest draw is its authentic sauna facilities introduced from Finland. Each of the men's and women's baths is equipped with a dry sauna that allows self löyly, offering a place to work up a good sweat while taking in the rich nature of Tokachi. It is also known for its winter avanto experience, in which a hole is cut in the frozen lake and used like a cold plunge bath, drawing devoted fans from all over Japan. The spring water is a natural hot spring drawn from Tomuraushi Onsen, and its gently alkaline water soothes the body after sauna sessions.
TypeNatural Hot Spring
A weakly alkaline natural hot spring drawn from the hidden Tomuraushi Onsen area. The water feels exceptionally gentle on the skin, softly enveloping sensitive skin after a sauna session. It also has a bath for low-stimulation bathing, making it ideal for alternating hot and cold baths and for long soaks.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
An authentic Finnish-style sauna equipped with a HARVIA stove and allowing self löyly. Renovated in 2022, it was reborn as a clean, inviting space with the pleasant scent of wood. In a quiet environment without TV, you can take your time and work up a sweat while adjusting the humidity to your liking.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath with a maximum depth of 140 cm, deep enough to cool your entire body thoroughly. Its sharp, icy-cold water quickly tightens up a body heated by the sauna.
Closed Days: None
〒081-0154 808 Kuttari, Shintoku-cho, Kamikawa-gun, Hokkaido
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 sanctuary for Finnish-style sauna and avanto experiences, embraced by the nature of the Tokachi River headwaters
Hokkaido Shintoku Town
Kuttari Onsen Lake Inn is a hot spring inn on the shores of Lake Kuttari in Shintoku, Hokkaido, attracting serious sauna enthusiasts. Its biggest draw is its authentic sauna facilities introduced from Finland. Each of the men's and women's baths is equipped with a dry sauna that allows self löyly, offering a place to work up a good sweat while taking in the rich nature of Tokachi. It is also known for its winter avanto experience, in which a hole is cut in the frozen lake and used like a cold plunge bath, drawing devoted fans from all over Japan. The spring water is a natural hot spring drawn from Tomuraushi Onsen, and its gently alkaline water soothes the body after sauna sessions.
TypeNatural Hot Spring
A weakly alkaline natural hot spring drawn from the hidden Tomuraushi Onsen area. The water feels exceptionally gentle on the skin, softly enveloping sensitive skin after a sauna session. It also has a bath for low-stimulation bathing, making it ideal for alternating hot and cold baths and for long soaks.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity6people
An authentic Finnish-style sauna equipped with a HARVIA stove and allowing self löyly. Renovated in 2022, it was reborn as a clean, inviting space with the pleasant scent of wood. In a quiet environment without TV, you can take your time and work up a sweat while adjusting the humidity to your liking.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath with a maximum depth of 140 cm, deep enough to cool your entire body thoroughly. Its sharp, icy-cold water quickly tightens up a body heated by the sauna.
Closed Days: None
〒081-0154 808 Kuttari, Shintoku-cho, Kamikawa-gun, Hokkaido
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