阿久根温泉
Kagoshima
Chloride springRadioactive spring
The water here
Chloride spring 塩化物泉
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Radioactive spring 放射能泉
Contains trace radon that leaves the water quickly. Also called radium or radon springs.
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Japanese Wikipedia
Other towns in Kagoshima