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美利河温泉 is a hot spring town in Hokkaido, Japan. The water leaves the ground at 41°C, comfortably warm. It measures pH 8.2 — mildly alkaline, the slippery kind. Officially the water is classed as chloride spring. Its sources put out around 219 litres a minute. 1 inns take visitors here.
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.
42.4683, 140.2016 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.