湯抱温泉 is a hot spring town in Shimane, Japan. The water leaves the ground at 20–36°C, comfortably warm. Officially the water is classed as chloride spring.
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.
35.0966, 132.5696 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.