
Photo: 663highland · CC BY 2.5 · Wikimedia Commons
Kaike Onsen is a hot spring town in Tottori, Japan. The water leaves the ground at 89°C, hot enough that it has to be cooled before anyone can get in. Officially the water is classed as chloride spring. Its sources put out around 56 litres a minute. 20 inns take visitors here. About 388,032 people a year come to bathe.
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.
35.4563, 133.3618 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.