Kohama Island Onsen
- Location
- Kohama Island, Okinawa Prefecture, Japan, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Kohama Island Onsen occupies a small, lushly vegetated island in the Yaeyama group where pineapple plantations stretch across gently rolling hills and the extraordinary Kaichu-doro road — briefly exposed at low tide — connects outlying reefs to the main island in a spectacle unique to Japan. Kohamajima's waters run clear over brilliant coral, and the onsen draws its mineral waters from the island's shallow geothermal activity, warmed by the same volcanic forces that shaped this corner of the East China Sea. The peaceful atmosphere of a community that numbers only a few hundred permanent residents makes every soak here feel like a deeply private encounter with Okinawa's island heritage.