下の茗温泉 is a hot spring town in Toyama, Japan. The water leaves the ground at 25–30°C, cool enough that the baths here are usually reheated. Officially the water is classed as simple 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.
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.
Figures from the town's Japanese Wikipedia article.
36.5523, 137.0944 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.