湯ヶ島温泉 is a hot spring town in Shizuoka, Japan. The water leaves the ground at 45–50°C, hot. Officially the water is classed as sulfate spring.
Clear water with a faintly bitter taste. Known for holding heat.
Figures from the town's Japanese Wikipedia article.
34.8933, 138.9292 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.