Ōboke Onsen is a hot spring town in Tokushima, Japan. The water leaves the ground at 21°C, cool enough that the baths here are usually reheated. Officially the water is classed as simple spring. 2 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.
33.8840, 133.7595 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.