Photo: No machine-readable author provided. おぉたむすねィく探検隊 assumed (based on copyright claims). · CC BY 2.5 · Wikimedia Commons
Kurokawa Onsen is a hot spring town in Hyogo, Japan. The water leaves the ground at 29.1°C, cool enough that the baths here are usually reheated. Officially the water is classed as simple spring. Its sources put out around 49 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.
35.2331, 134.8804 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.