Niimi Onsen Okayama
- Location
- Niimi, Okayama, Japan
- Water type
- bicarbonate
- Temperature
- 39 °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 Okayama is a natural hot spring in Niimi, a city in northwestern Okayama Prefecture, Japan, situated in the Nishichugoku Sanchi mountain highlands at the boundary with Hiroshima Prefecture, a region of rivers, cedar forests, and the famous Manpukuji stalactite cave — one of Japan's most spectacular limestone cavern systems, reflecting the geological richness of this Chugoku mountain interior. The naturally bicarbonate-rich spring waters here are valued for their alkaline, skin-softening, and digestive-supportive properties characteristic of the Chugoku mountain region's mineral spring character, providing a restorative therapeutic soak in a city whose limestone geology produces both spectacular caves above ground and mineral-enriched spring waters below. The combination of the extraordinary Manpukuji limestone cave system, the scenic Chugoku mountain highland landscape, and the gentle therapeutic wellness of natural bicarbonate hot spring bathing makes Niimi Onsen a quietly rewarding destination in Okayama Prefecture's scenic interior.