Kiyama Radium Onsen
Kiyama, Saga, Japan
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- Location
- Kiyama, Saga, Japan
- Water type
- radioactive
- Temperature
- 37 °C
- pH
- 7.3
Water profile
Thermicity
Neutral
LowHigh
Soothing — neither hot nor cold, perfect balance.
Mineralisation
Bio-active
LowHigh
Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
RadonLithiumBicarbonates
Kiyama Radium Onsen, in Kiyama, Saga Prefecture, draws radioactive (radon) thermal water at 37°C. The bathhouse includes an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Kiyama Radium Onsen' in Kiyama-cho, Saga — one of northern Kyushu's naturally occurring radon springs found in the granitic basement rocks beneath the Chikugo plain. Japan classifies these 放射能泉 (hoshano-sen) as a recognised water type in traditional Japanese balneology, associated with a toning and invigorating sensation. Kiyama's radon spring draws visitors from across the Fukuoka-Saga border for this unusual geological phenomenon.
Nearby
Frequently asked questions
How hot is the water?
The water is neutral here, around 37 °C — a perfect balance, neither too hot nor too cold.
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.