Hachikuro Onsen
八九郎温泉はちきゅうろうおんせん
Wild Onsen
Tohoku·Akita
Day Use
YesBathing & Water
Natural onsen water
Uses natural hot spring water
Indoor BathYes
Enclosed indoor bathing area
Bathing Arrangements
Mixed BathingNo
Shared bathing area for all genders
Policies & Services
WashingNo
Shower, wash stations, soap and shampoo provided
ParkingYes
On-site or nearby parking available
About
Hachikuro Onsen (八九郎温泉, はちきゅうろうおんせん) is a wild spring tucked inside a vinyl greenhouse on the edge of farmland and forest in Kosaka, Akita. The water is noticeably carbonated, bubbling visibly at the spout. There are separate baths for men and women, no showers, and no towels provided. Entry is by donation, left in a box at the door. No operator, no fixed hours.
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Last updated June 25, 2026