
Photo: photo: Qurren (talk) Taken with Canon IXY 430F (Digital IXUS 245 HS) · CC BY-SA 3.0 · Wikimedia Commons
Nashigi Onsen is a hot spring town in Gunma, Japan. The water leaves the ground at 28°C, cool enough that the baths here are usually reheated. Officially the water is classed as chloride spring, bicarbonate spring and carbon dioxide spring.
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.
Fine bubbles cling to your skin. Rare in Japan, and usually cooler than other springs.
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.