
Photo: hiroooooki from Tokyo, Japan · CC BY 2.0 · Wikimedia Commons
Kurokawa Onsen is a hot spring town in Kumamoto, Japan. The water leaves the ground at 80–98°C, hot enough that it has to be cooled before anyone can get in. Officially the water is classed as sulfur spring.
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.
33.0781, 131.1417 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.