
Photo: 日詰さん · CC BY-SA 4.0 · Wikimedia Commons
Yamada Onsen is a hot spring town in Nagano, Japan. The water leaves the ground at 50–70°C, hot. Officially the water is classed as chloride spring and sulfur spring.
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.
36.6721, 138.4246 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.