A wild hot spring (noyu) located in the mountains of Kozancho, Noboribetsu City, Hokkaido. A tatami-mat-sized bathtub sits beside the Washibetsu Raiba River, a tributary of the Iburi Horobetsu River, with hot spring water naturally flowing from the bottom.

Discovered in 1908 by Kawamata Hyokichi, a therapeutic inn was opened in 1932 by his grandson Terumitsu but was destroyed by a typhoon in 1956. It now remains as a wild hot spring.

Spring quality: gypsum-hydrogen sulfide spring, temperature about 34-36°C (lukewarm). Known as a quality hot spring for relaxed bathing.

【Important Safety Notes】

・Bear habitat area - bear bells and bear spray required

・Must cross 4 rivers - wading footwear (beach sandals etc.) necessary

・Dangerous when water levels are high - bathing prohibited

・No mobile phone signal

・Avoid solo bathing - go in groups