安房温泉 is a hot spring town in Chiba, Japan. The water leaves the ground at 18.3°C, cool enough that the baths here are usually reheated. It measures pH 7.3 — close to neutral. Officially the water is classed as chloride spring and bicarbonate spring. 4 inns take visitors here.
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
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.