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古遠部温泉 is a hot spring town in Aomori, Japan. The water leaves the ground at 42°C, hot. It measures pH 7.5 — close to neutral. Officially the water is classed as chloride spring and sulfate spring. Its sources put out around 800 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.
Clear water with a faintly bitter taste. Known for holding heat.
Figures from the town's Japanese Wikipedia article.
40.4299, 140.6630 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.