Tennen Onsen; Bubutan
Kumamoto, Kumamoto, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Kumamoto, Kumamoto, 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
Tennen Onsen (Bubutan), in Kumamoto city, heats sodium-chloride water to 41°C. The bathhouse offers an indoor bath, an open-air outdoor bath (rotenburo) and a sauna.
Insider tip — Bubutan Onsen serves the commercial heart of Kumamoto City, capital of Kyushu most agricultural prefecture and home of one of Japan three great surviving castle keeps — the magnificent Kumamoto Castle whose massive curved stone walls (musha-gaeshi) withstood every assault in the 1877 Seinan War. The castle was severely damaged in the 2016 Kumamoto earthquake and its meticulous reconstruction using traditional Edo-period joinery techniques, scheduled for completion in 2037, has become Japan most ambitious castle restoration project of the modern era.
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.