花敷温泉 is a hot spring town in Gunma, Japan. The water leaves the ground at 58°C, hot. It measures pH 7.4–7.48 — close to neutral. Officially the water is classed as simple spring. Its sources put out around 200 litres a minute. 1 inns take visitors here with room for about 20 guests.
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.
36.6476, 138.6478 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.