Photo: Pekachu · CC BY-SA 4.0 · Wikimedia Commons
Kumanokawa Onsen is a hot spring town in Saga, Japan. The water leaves the ground at 32.9–38.7°C, comfortably warm. Officially the water is classed as radioactive spring. Its sources put out around 60 litres a minute. 7 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.
33.3656, 130.2417 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.