雨畑湖温泉 is a hot spring town in Yamanashi, Japan. The water leaves the ground at 14.7°C, cool enough that the baths here are usually reheated. It measures pH 7.1 — close to neutral. Officially the water is classed as sulfur spring. 1 inns take visitors here.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
Figures from the town's Japanese Wikipedia article.
35.4057, 138.3267 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.