長者原温泉 is a hot spring town in Oita, Japan. The water leaves the ground at 42°C, hot. Officially the water is classed as bicarbonate spring and sulfur spring. 10 inns take visitors here.
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
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.
33.1166, 131.2282 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.