Akayu Onsen (Fukushima) is a hot spring town in Fukushima, Japan. The water leaves the ground at 49.1–53.9°C, hot. It measures pH 6.1 — close to neutral. Officially the water is classed as simple spring, iron spring and sulfur spring. 1 inns take visitors here.
Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Turns reddish brown as the iron meets air. The water is clear at the source.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.




Places from Wikidata, photographs from Wikimedia Commons. Distances are in a straight line from the town.
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.
37.6718, 140.2625 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.