Kojigoku Onsenkan

Kojigoku Onsenkan is a day-use hot spring facility located in the mountainous area of Unzen City, Nagasaki Prefecture. Situated in a quiet natural setting, the site is marked by white steam rising around the grounds. Visitors include both local residents and travelers from farther afield who come to bathe and relax.

The hot spring water delivered to the baths at Kojigoku Onsenkan comes directly from a nearby source behind the building. This water is cloudy and white, notable for its soft texture and distinctive sulfur scent. The baths employ an open-flow system that ensures fresh hot spring water constantly fills the pools, which are maintained at a comfortable temperature of 40 to 43 degrees Celsius.

While providing the genuine atmosphere of a hot spring, Kojigoku Onsenkan also offers the casual convenience of a day facility. It is a place where people often stop by after a walk in the surrounding nature, serving both as a local communal spot for relaxation and a point of rest for those exploring the Unzen area.