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Akayu Onsen
Yamagata · 赤湯温泉
Akayu Onsen is a hot spring town in Yamagata, Japan. It measures pH 7.3–9.5 — close to neutral. Officially the water is classed as chloride spring. Its sources put out around 1 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.