
Photo: TANAKA Juuyoh (田中十洋) · CC BY 2.0 · Wikimedia Commons
Ikenotaira Onsen is a hot spring town in Niigata, Japan. The water leaves the ground at 72°C, hot. Officially the water is classed as sulfur spring. 20 inns take visitors here.
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.
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.