Mishima Onsen
Kusu, Oita, Japan
- Location
- Kusu, Oita, Japan
- Water type
- thermal, sodium chloride
- Temperature
- 40 °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
Mishima Onsen is located in Kusu, Oita Prefecture. Its sodium-chloride thermal water reaches around 40°C, with an indoor bath, an outdoor rotenburo bath and a sauna available.
Insider tip — 'Mishima Onsen' in Kusu-machi, a small agricultural town in interior Oita Prefecture where the Yamakuni River watershed feeds into the Chikugo River basin. 'Mishima' (三島 — three islands) is a place name found across Japan, often referencing three islands, rocks, or landforms. Kusu is a transitional landscape between the volcanic highlands of Aso-Kuju National Park and the forested river valleys of western Oita, and its thermal springs reflect this position between mountain and valley geology.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.