Odo Onsen is a hot spring town in Aichi, Japan. The water leaves the ground at 9.7°C, cool enough that the baths here are usually reheated. Officially the water is classed as radioactive spring.
Contains trace radon that leaves the water quickly. Also called radium or radon springs.
More photographs
From Wikimedia Commons. Tap a photo for the photographer and licence.
With tattoos
Many public baths still turn away visible tattoos, and the rule is set by each bath, not by the town. The reliable way round it is to bathe privately: a room with its own open-air bath, or an inn with a private bath you can book for yourselves.