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Biratori Onsen is a hot spring town in Hokkaido, Japan. The water leaves the ground at 14.5°C, cool enough that the baths here are usually reheated. It measures pH 6.9 — close to neutral. 1 inns take visitors here.
The water type for this town has not been identified yet. It is on the list to check.
Figures from the town's Japanese Wikipedia article.
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.