Tatara Onsen
- Location
- Hiroshima, Hiroshima, Japan
- Water type
- iron-rich
- Temperature
- 38 °C
- pH
- 6.3
Water profile
Soothing — neither hot nor cold, perfect balance.
Rich in active gases or metals — a strong mineral character.
Soft water — natural, classic buoyancy.
Tatara Onsen is a hot spring in Japan whose ferruginous mineral waters, rich in dissolved iron compounds, are traditionally associated with the invigorating, tonic quality that iron-bearing springs hold within Japan's hot spring tradition. The distinctive reddish coloration that often characterizes ferruginous spring water reflects the high iron content that oxidizes on contact with air, and this visual mineral richness has long been associated in Japanese bathing culture with potency and a sense of vitality. Iron-bearing hot springs are distributed across Japan's volcanic arc wherever geothermal waters interact with iron-rich rock formations, and Tatara Onsen represents this valued mineral spring type within the broader landscape of Japanese thermal bathing heritage.