
Kawayu Onsen
onsen
川湯温泉
Hot Water River where thermal water bubbles from riverbed, allowing natural bathing in geological gift setting.
Hot spring town in the Kawayu district of Akan-Mashu National Park, its waters heated by Mt. Io, an active volcano 2.5 kilometers away. The sulfuric spring water has a low pH of around 1.6, giving it the antibacterial properties that have drawn visitors since the town's first inn opened in 1898. A footbath in the town center, fed directly by geothermal springs, is free to use and lit at night. Kawayu Jinja Shrine nearby has one of Japan's only hot-spring-fed temizuya purification basins at its entrance. Surrounding the town, the national park offers canoeing, cycling, and hiking through volcanic terrain.
From late November to mid-February, the tourism board excavates a large communal bath (sennin-buro) directly in the Oto River bed, heated naturally by geothermal activity to 40 to 42°C along a 1km stretch. Entry to the river bath is free. At other times of year, the riverbed returns to a regular river but the surrounding ryokans maintain private baths fed from the same spring. Access is by Kumano Kotsu bus from Shingu Station (40 minutes).
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