Otani Onsen
Otani Onsen, which stands quietly in the mountains where nature has been left untouched, boasts the highest concentration of radon in Iwate Prefecture, and its highly effective spring quality is said to warm both the mind and body, making it a communal bathing spot for locals throughout the year. It is also popular as a hot spring spa that attracts hot spring bathers from all over the world.
Hirono Town
Northern Iwate