The Hot Spring That Breathes

Misasa Onsen, in the hills of central Tottori, holds one of the world’s highest concentrations of radon in its spring water — a trace radioactivity that Japanese balneology credits with stimulating metabolism and immunity (the “hormesis effect,” studied here for decades by Okayama University’s medical facility). Whatever your view of the science, the culture around it is unique: at Misasa you don’t just soak the water, you drink it at public fountains and even breathe it in dedicated radon steam rooms. The town’s name means “three mornings” — stay three, the saying goes, and leave healed.

What Makes the Town Itself Special

The free riverbed bath

In the middle of the Misasa River, beside the main bridge, sits a 24-hour, free, mixed open-air bath — no walls, no attendant, just source-flowing hot water and whatever nerve you brought. Locals use it at dawn; travelers tend to try it after dark. It is the town’s honesty test and its symbol.

A street built for yukata

The lantern-lit main lane keeps a Showa-era rhythm: a candy shop, sake brewers, retro cafes, small free footbaths, and — in early summer — fireflies along the river with the bell-like call of kajika frogs. The ceramic frog on Koitani Bridge grants love to those who pat it, locals say.

The Side Trips Foreigners Skip

Twenty minutes away, Kurayoshi’s white-walled storehouse district lines a carp-filled canal with Edo and Meiji era warehouses — red roof tiles, sake breweries, no crowds. Rail fans and walkers should continue to the abandoned Kurayoshi Line: a decommissioned railway where the tracks remain, famously swallowed by a bamboo grove — one of Japan’s most atmospheric haikyo walks, and completely legal.

Practical Notes

  • Access: bus (about 20 minutes) from Kurayoshi Station on the San’in Line; roughly 2.5 hours from Osaka via Super Hakuto express to Kurayoshi
  • Drinking fountains: small cups provided — the mineral water is said to double gastric blood flow; sip, don’t chug
  • Combine with: Mt. Mitoku’s Nageiredo climb (the two form Japan Heritage No. 1)
  • Etiquette: the river bath has no changing room — a towel and timing are your friends

Misasa is what onsen towns were before marketing departments: slightly eccentric, medically serious, and completely unbothered about impressing you.