Niimi Onsen
- Location
- Niimi, Okayama Prefecture, Japan, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Niimi Onsen is located in Niimi City, Okayama Prefecture, in the Takahashi River valley of western Okayama where the extraordinary Abechikanmon cave system — one of Japan's largest limestone caverns, featuring dramatic stalactite and stalagmite formations — creates a major natural attraction in this mountainous part of the Chugoku region. The siliceous thermal waters here serve a city whose geological heritage encompasses both the underground limestone cave landscapes and the volcanic hot spring resources of the broader Chugoku Mountain geological complex. Bathing at Niimi Onsen provides a complete natural heritage experience in western Okayama, where the mineral spring wellness of siliceous thermal bathing complements the extraordinary geological spectacle of the Abechikanmon limestone caves in a landscape of remarkable underground and surface geological diversity.