
柳川温泉 is a hot spring town in Yamagata, Japan. The water leaves the ground at 56.7°C, hot. It measures pH 8.2 — mildly alkaline, the slippery kind. Officially the water is classed as chloride spring, sulfate spring and sulfur spring. Its sources put out around 432,000 litres a minute. 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.
Clear water with a faintly bitter taste. Known for holding heat.
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.
38.3700, 140.0600 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.