An authentic Finnish-style sauna and source-fed open-air bath embraced by Otaru’s nature
Hokkaido Otaru City
"Asarigawa Onsen Hotel" is a hot spring hotel located in Asarigawa Onsen Gorge, the inner retreat of Otaru. Its biggest attraction is the authentic Finnish-style sauna, newly installed in December 2023, where guests can enjoy self löyly using a HARVIA stove. From the sauna room, you can go directly to the outdoor air bath area, making it possible to experience blissful totonou in Otaru’s crisp air. The natural hot spring is a calcium-sodium chloride spring with excellent heat-retention properties. In the open-air bath near the source, you can relax body and mind while taking in the seasonal beauty of nature.
TypeNatural Hot Spring
A natural hot spring of calcium-sodium chloride spring water. With a gentle low-tonicity, mildly alkaline feel, it warms you through to the core and helps keep you from cooling off quickly after bathing. In the open-air bath near the source, you can enjoy a luxurious soak while feeling the nature of Asarigawa.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
An authentic Finnish-style dry sauna that opened at the end of 2023. A HARVIA sauna stove has been installed, allowing you to create your preferred level of humidity and heat with self löyly. In the clean, wood-scented room, you can enjoy a high-quality sweat session.
Water QualityHot Spring Water
Capacity2people
A sharply cold cold plunge bath using free-flowing cold spring water. Depending on the setting, it can feel close to a single-digit temperature bath (under 10 degrees), quickly cooling down a body warmed by the sauna and delivering an intense sense of refreshment. The flow from the sauna is also excellent, allowing for a smooth cooldown.
Closed Days: None
〒047-0154 2-670 Asarigawa Onsen, Otaru, 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
An authentic Finnish-style sauna and source-fed open-air bath embraced by Otaru’s nature
Hokkaido Otaru City
"Asarigawa Onsen Hotel" is a hot spring hotel located in Asarigawa Onsen Gorge, the inner retreat of Otaru. Its biggest attraction is the authentic Finnish-style sauna, newly installed in December 2023, where guests can enjoy self löyly using a HARVIA stove. From the sauna room, you can go directly to the outdoor air bath area, making it possible to experience blissful totonou in Otaru’s crisp air. The natural hot spring is a calcium-sodium chloride spring with excellent heat-retention properties. In the open-air bath near the source, you can relax body and mind while taking in the seasonal beauty of nature.
TypeNatural Hot Spring
A natural hot spring of calcium-sodium chloride spring water. With a gentle low-tonicity, mildly alkaline feel, it warms you through to the core and helps keep you from cooling off quickly after bathing. In the open-air bath near the source, you can enjoy a luxurious soak while feeling the nature of Asarigawa.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
An authentic Finnish-style dry sauna that opened at the end of 2023. A HARVIA sauna stove has been installed, allowing you to create your preferred level of humidity and heat with self löyly. In the clean, wood-scented room, you can enjoy a high-quality sweat session.
Water QualityHot Spring Water
Capacity2people
A sharply cold cold plunge bath using free-flowing cold spring water. Depending on the setting, it can feel close to a single-digit temperature bath (under 10 degrees), quickly cooling down a body warmed by the sauna and delivering an intense sense of refreshment. The flow from the sauna is also excellent, allowing for a smooth cooldown.
Closed Days: None
〒047-0154 2-670 Asarigawa Onsen, Otaru, 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