湯田温泉峡 is a hot spring town in Iwate, Japan. Officially the water is classed as simple spring, chloride spring, sulfate spring and sulfur spring.
Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Clear water with a faintly bitter taste. Known for holding heat.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.