神居岩温泉 is a hot spring town in Hokkaido, Japan. The water leaves the ground at 11°C, cool enough that the baths here are usually reheated. Officially the water is classed as chloride spring and sulfur spring. 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.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
Figures from the town's Japanese Wikipedia article.
43.9396, 141.6834 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.