Iwaido Onsen (Toyama)
- Location
- Himi, Toyama, Japan
- Water type
- sodium chloride
- Temperature
- 40 °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.
Iwaido Onsen is located in Toyama Prefecture in the former Etchu Province, where the dramatic landscape of mountains plunging toward the Sea of Japan creates a geothermal environment of remarkable intensity and mineral richness. The spring draws visitors with its naturally heated waters rising from deep volcanic layers beneath mountain terrain that defines this northwestern corner of Honshu, a region shaped by both the weight of heavy snowfall and the heat of the earth's interior. Iwaido Onsen captures the frontier spirit of a coastal mountain prefecture where thermal bathing has long provided essential warmth and community at the intersection of alpine cold and geothermal energy.