Kodokoro Onsen
Illustration photo — not a verified picture of this exact spot.
- Location
- Iga, Mie, Japan
- Water type
- bicarbonate
- Temperature
- 38 °C
- pH
- 8
Water profile
Soothing — neither hot nor cold, perfect balance.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Kodokoro Onsen is a hot spring in Japan whose bicarbonate and simple mineral waters provide a gentle and accessible relaxing bathing experience valued for the alkaline skin-care character of bicarbonate spring water combined with the universal warmth and cleansing of naturally heated geothermal mineral water. The Japanese hot spring tradition regards bicarbonate springs as particularly pleasant for the skin through the gentle action that produces the characteristically smooth and silky sensation of alkaline mineral water immersion, and this reputation has made bicarbonate springs some of the most sought-after among Japanese bathing enthusiasts who prioritize the comfort of their skin. The simple character of the secondary mineral component ensures that the Kodokoro spring waters are accessible and soothing for a broad range of bathers, including those with sensitive skin who may prefer to avoid the more intensely mineralized volcanic spring types found elsewhere in Japan's diverse thermal heritage.