Minamiaiki Onsen (Naosaka Onsen)
TypeNatural Hot Spring
Simple hot spring (low-solute, weakly alkaline, low-temperature spring). The water is soft and gentle on the skin, leaving you feeling refreshed after bathing.
Open-air baths overlooking a waterfall and authentic saunas alternating daily
Nagano Minamiaiki Village
Minamiaiki Onsen Takimi no Yu is a day-use hot spring facility in Minamiaiki Village, Nagano Prefecture. As the name suggests, the open-air bath overlooks the Inukoro no Taki waterfall. With areas that alternate daily between men and women, you can enjoy a high-temperature dry sauna around 100°C, a Finnish-style sauna where self-löyly is possible, and a mist sauna. An ice-cold jar-shaped cold plunge bath and open-air relaxation surrounded by rich nature let you spend a blissful time.
TypeNatural Hot Spring
Simple hot spring (low-solute, weakly alkaline, low-temperature spring). The water is soft and gentle on the skin, leaving you feeling refreshed after bathing.
Sauna TypeDry Sauna
Stove Typegas
Capacity8people
A high-temperature dry sauna at about 100°C available in areas that alternate daily between men and women. It is set up for a thorough sweat.
Sauna TypeDry Sauna
Stove Typeelectric
Capacity6people
A Finnish-style sauna in the area that alternates daily between men and women. Set at around 80-90°C, self-löyly is possible. A mist sauna is also located in the same area.
Capacity1people
A single-person jar-shaped cold plunge bath located right next to the sauna. The water temperature is about 14-16°C and is thoroughly chilled, allowing you to cool down comfortably on your own.
Closed Days: Tuesday
〒384-1211 5633-1 Minamiaiki Village, Minamisaku District, Nagano Prefecture, 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
Open-air baths overlooking a waterfall and authentic saunas alternating daily
Nagano Minamiaiki Village
Minamiaiki Onsen Takimi no Yu is a day-use hot spring facility in Minamiaiki Village, Nagano Prefecture. As the name suggests, the open-air bath overlooks the Inukoro no Taki waterfall. With areas that alternate daily between men and women, you can enjoy a high-temperature dry sauna around 100°C, a Finnish-style sauna where self-löyly is possible, and a mist sauna. An ice-cold jar-shaped cold plunge bath and open-air relaxation surrounded by rich nature let you spend a blissful time.
TypeNatural Hot Spring
Simple hot spring (low-solute, weakly alkaline, low-temperature spring). The water is soft and gentle on the skin, leaving you feeling refreshed after bathing.
Sauna TypeDry Sauna
Stove Typegas
Capacity8people
A high-temperature dry sauna at about 100°C available in areas that alternate daily between men and women. It is set up for a thorough sweat.
Sauna TypeDry Sauna
Stove Typeelectric
Capacity6people
A Finnish-style sauna in the area that alternates daily between men and women. Set at around 80-90°C, self-löyly is possible. A mist sauna is also located in the same area.
Capacity1people
A single-person jar-shaped cold plunge bath located right next to the sauna. The water temperature is about 14-16°C and is thoroughly chilled, allowing you to cool down comfortably on your own.
Closed Days: Tuesday
〒384-1211 5633-1 Minamiaiki Village, Minamisaku District, Nagano Prefecture, 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