Shisui Radon Onsen
Kumamoto, Kumamoto, Japan
- Location
- Kumamoto, Kumamoto, Japan
- Water type
- radioactive
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Bio-active
LowHigh
Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
RadonLithiumBicarbonates
Shisui Radon Onsen, in the city of Kumamoto, draws radon-bearing water at 40°C. Guests can use an indoor bath, an outdoor bath (rotenburo) and a sauna, in the classic style of Japanese onsen.
Insider tip — Shisui Radon Onsen is one of Kumamoto's radon-spring facilities, where low-level radioactive radon gas dissolved in the water is traditionally associated with anti-inflammatory and immune-stimulating effects. Radon springs are a respected niche in Japanese balneology, and regular bathers often cite relief from arthritis and neuralgia. The clear, odourless water gives no outward sign of its unusual mineral content. Soak time recommendations are typically limited to 10-15 minutes per session.
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 radioactive water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).