Flow-through brown hot spring and ice-cold plunge bath attached to Michi no Eki Otari
Nagano Otari Village
Miyama no Yu Onsen is a day-use hot spring facility attached to Michi no Eki Otari along National Route 148 in Otari, Nagano Prefecture. Its brown sodium bicarbonate spring, blended from two sources and offered as a flow-through bath, is a high-quality hot spring that even enthusiasts praise. The facility features a dry sauna at approximately 90–100°C and an ice-cold plunge bath chilled to 12–15°C using natural mountain water. There is also a handy service that halves the bathing fee when you use the dining area.
TypeNatural Hot Spring
Sodium bicarbonate spring. Two sources are mixed and adjusted to a suitable temperature, producing a brown, slightly cloudy spring with a faint iron smell that offers an authentic hot spring experience. There are hot baths, lukewarm baths, and an outdoor bath.
Sauna TypeDry Sauna
Stove Typeelectric
Capacity6people
A dry sauna equipped with a convection-style heater at approximately 90–100°C. There is no TV; soothing ambient music plays in a calm space where you can work up a good sweat.
Water Qualitynatural_water
Capacity3people
A cold plunge bath located directly in front of the sauna. It uses mountain spring water (groundwater) as a flow-through supply; the water temperature is 12–15°C, it is very cold, and the water is potable.
Closed Days: Wednesday
1861-1 Kita-Otari, Otari-mura, Kitaazumi-gun, Nagano 399-9601, 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
Flow-through brown hot spring and ice-cold plunge bath attached to Michi no Eki Otari
Nagano Otari Village
Miyama no Yu Onsen is a day-use hot spring facility attached to Michi no Eki Otari along National Route 148 in Otari, Nagano Prefecture. Its brown sodium bicarbonate spring, blended from two sources and offered as a flow-through bath, is a high-quality hot spring that even enthusiasts praise. The facility features a dry sauna at approximately 90–100°C and an ice-cold plunge bath chilled to 12–15°C using natural mountain water. There is also a handy service that halves the bathing fee when you use the dining area.
TypeNatural Hot Spring
Sodium bicarbonate spring. Two sources are mixed and adjusted to a suitable temperature, producing a brown, slightly cloudy spring with a faint iron smell that offers an authentic hot spring experience. There are hot baths, lukewarm baths, and an outdoor bath.
Sauna TypeDry Sauna
Stove Typeelectric
Capacity6people
A dry sauna equipped with a convection-style heater at approximately 90–100°C. There is no TV; soothing ambient music plays in a calm space where you can work up a good sweat.
Water Qualitynatural_water
Capacity3people
A cold plunge bath located directly in front of the sauna. It uses mountain spring water (groundwater) as a flow-through supply; the water temperature is 12–15°C, it is very cold, and the water is potable.
Closed Days: Wednesday
1861-1 Kita-Otari, Otari-mura, Kitaazumi-gun, Nagano 399-9601, 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