
Photo: 水だらけのプール · CC BY-SA 4.0 · Wikimedia Commons
薬王寺温泉 is a hot spring town in Fukuoka, Japan. The water leaves the ground at 25°C, cool enough that the baths here are usually reheated. Officially the water is classed as radioactive spring. 2 inns take visitors here.
Contains trace radon that leaves the water quickly. Also called radium or radon springs.
Figures from the town's Japanese Wikipedia article.
33.7122, 130.5233 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.