Hakkannon Onsen is a hot spring town in Saitama, Japan. The water leaves the ground at 57.3°C, hot. It measures pH 7.55 — mildly alkaline, the slippery kind. Officially the water is classed as chloride spring and iodine spring. Its sources put out around 2,250 litres a minute.
Places from Wikidata, photographs from Wikimedia Commons. Distances are in a straight line from the town.
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.