
Photo: 快左衛門 · CC BY-SA 3.0 · Wikimedia Commons
船瀬温泉 is a hot spring town in Tokushima, Japan. The water leaves the ground at 41.4°C, comfortably warm. Officially the water is classed as simple spring. Its sources put out around 90 litres a minute.
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.
33.8317, 134.7265 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.