Minuma Tennen Onsen Koharu Biyori is a day-use hot spring in Minuma ward drawing a strong sodium-chloride spring from 1,530 m that turns brown in the air, served unheated and heated in open-air and indoor pools. The tower sauna for men and women runs at about 90°C on the top bench and 70°C below, with a cold-water bath lined with binchotan charcoal and a 40°C nano-hydrogen ganbanyoku. Open 10:00–24:00 on weekdays and 9:00–24:00 at weekends; adults pay 950 yen on weekdays.
Amenities
Sauna Rituals
Cold Plunge
Private Sauna Available
Opening Hours
Monday to Friday: 10:00 AM – 12:00 AM; Saturday to Sunday: 9:00 AM – 12:00 AM