Kawayu Onsen, building in Teshikaga, Hokkaido Prefecture, Japan
Kawayu Onsen is a small hot spring town situated near Mount Iou, an active volcano that supplies the highly acidic thermal waters. The settlement contains several ryokans and public bathing facilities where visitors can soak in waters that flow naturally from geothermal sources beneath the earth.
This settlement developed across generations as a destination for thermal bathing, with locals and travelers seeking the mineral-rich waters. The site sits within Japan's largest caldera, whose ongoing volcanic activity has powered the hot springs for centuries.
The town centers around communal bathing traditions that shape daily life for both residents and visitors. The hot spring culture here reflects a way of living where natural thermal waters are woven into regular routines and social gatherings.
The town is easily reached by train to the nearby station followed by a short bus ride of about ten minutes into the center. Alternatively, visitors can walk from the station in just over an hour through forested areas dotted with natural steam vents.
The waters here are exceptionally acidic with a pH just above one, making them notably different from most hot springs worldwide. This high mineral concentration creates a distinctive bathing experience that many visitors associate with skin benefits and natural wellness.
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