
Photo: Opqr · CC BY-SA 3.0 · Wikimedia Commons
うすずみ温泉 is a hot spring town in Gifu, Japan. Officially the water is classed as chloride spring. 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.
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.