Yumen Onsen
Akaiwa, Okayama, Japan
- Location
- Akaiwa, Okayama, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Yumen Onsen is located in Akaiwa, Okayama prefecture. Its sodium-chloride water at 41°C feeds an indoor bath and an outdoor rotenburo, complemented by a sauna.
Insider tip — In Akaiwa, the Okayama city known for its traditional Bizen-yaki pottery — one of Japan's six ancient kiln traditions, famous for its unglazed iron-rich stonewear fired in wood-burning kilns — Yumen Onsen (dream garden spring) offers mineral bathing in the fertile Yoshii River valley; combine the pottery studios of the Bizen area with this onsen for a complete appreciation of Okayama's deep artisan heritage.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.