
Photo: しんかわな · CC BY-SA 3.0 · Wikimedia Commons
Kanzanji Onsen is a hot spring town in Shizuoka, Japan. The water leaves the ground at 23.8–33.7°C, cool enough that the baths here are usually reheated. Officially the water is classed as chloride spring.
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Figures from the town's Japanese Wikipedia article.
34.7616, 137.6159 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.