
Photo: photo: Qurren (talk) Canon PowerShot G9 X · CC BY-SA 4.0 · Wikimedia Commons
Itoigawa Onsen is a hot spring town in Niigata, Japan. The water leaves the ground at 96°C, hot enough that it has to be cooled before anyone can get in. It measures pH 7.5 — close to neutral. Officially the water is classed as chloride spring. Its sources put out around 1,500 litres a minute. 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.
From Wikimedia Commons. Tap a photo for the photographer and licence.
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.







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.