Iwaido Onsen is a hot spring town in Toyama, Japan. The water leaves the ground at 49.9–54.2°C, hot. It measures pH 1–8.08 — strongly acidic, the kind that stings on a cut. Officially the water is classed as chloride spring. Its sources put out around 62 litres a minute. 4 inns take visitors here.
Getting there
From Kyoto / Osakaabout 3 h
CarNot needed
JR PassCovers the train
Train to Himi Station (JR)
Local bus, about 15 min
Fly into Kansai (KIX) or Itami. Times are rough estimates worked out from station locations, not a timetable — check the exact route on Google Maps.
Chloride spring
The water here
Chloride spring 塩化物泉
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
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.