Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Turns reddish brown as the iron meets air. The water is clear at the source.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
37.6718, 140.2625 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.