Takakuma Radium; Sarugajo Onsen
Tarumizu, Kagoshima, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Tarumizu, Kagoshima, 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
Takakuma Radium; Sarugajo Onsen is set in Tarumizu, Kagoshima Prefecture. The water here is classified as radioactive, with a temperature of 37°C. The facility offers an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — 'Sarugajo Onsen' (猿ヶ城 — monkey castle) at Takakuma Radium Onsen, near the Sarugajo Gorge in Tarumizu — a ravine famous for its wild Japanese macaque population. The Takakuma mountain range (1,237 m) rises above Tarumizu, and its ancient granite formations — distinct from Sakurajima's volcanic rocks — produce naturally occurring radon in the spring waters. Japan classifies these as 放射能泉 (hoshano-sen), medically recognised for circulation and metabolic benefits.
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.