Hosenji Onsen
- Location
- Kokonoe, Oita, Japan
- Water type
- carbonated
- Temperature
- 38 °C
- pH
- 6.3
Water profile
Soothing — neither hot nor cold, perfect balance.
Loaded with major ions — the essential minerals (Ca, Mg).
Mineralised water — eases movement and joints.
Hosenji Onsen is a hot spring in Oita Prefecture on Kyushu Island, whose acidic mineral waters carry the intensely mineral character of volcanic acid springs that are among the most distinctive in the Japanese bathing classification, long appreciated within a thermal tradition for the comfort they leave on the skin. Acidic hot springs are concentrated in Oita and Kumamoto Prefectures within the Beppu and Aso volcanic zones of Kyushu, where the intense geothermal activity generates springs of notable acidity that have been enjoyed since ancient times, and Oita Prefecture's preeminent position in Japanese hot spring culture is reflected in the extraordinary diversity of its spring types from the milky sulfurous waters of Beppu to the clear acid springs found in the highland volcanic areas. The tradition of acidic spring bathing is one of the most storied in Japanese hot spring culture, and Hosenji Onsen represents this bathing tradition within the exceptional geothermal landscape of Oita Prefecture.