
Photo: 水だらけのプール · CC0 · Wikimedia Commons
玉名温泉 is a hot spring town in Kumamoto, Japan. The water leaves the ground at 40–45°C, hot. Officially the water is classed as simple spring. 20 inns take visitors here.
Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Figures from the town's Japanese Wikipedia article.
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.