湯ノ網温泉 is a hot spring town in Ibaraki, Japan. The water leaves the ground at 13.6°C, cool enough that the baths here are usually reheated. Officially the water is classed as chloride spring, bicarbonate spring and iron 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.
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
Turns reddish brown as the iron meets air. The water is clear at the source.
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.