Himekami Hot spa is a hot spring town in Iwate, Japan. The water leaves the ground at 39°C, comfortably warm. It measures pH 8.2 — mildly alkaline, the slippery kind. Officially the water is classed as simple spring. 1 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.
39.8598, 141.1130 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.