Hot spring
Takaragawa Onsen Osenkaku
Minakami, Gunma Prefecture, JP
- Nudity required
- All ages welcome
- Private, authorised
- Status unknown
Last checked Aug 2026
Takaragawa Onsen Osenkaku, in the mountains of Minakami, Gunma Prefecture, is one of Japan's largest and most famous outdoor hot spring resorts, with several riverside rotenburo (open-air baths) that have long operated as mixed-gender (konyoku) bathing. Like other historic Japanese onsen with mixed bathing, this reflects a centuries-old hygiene and relaxation custom rather than Western naturist philosophy, and the resort maintains strict etiquette around modesty, photography, and conduct.
Know before you go
Visitors can bathe day-trip style during set hours or stay overnight at the ryokan; small modesty towels are customary even in mixed baths, and photography inside the bathing areas is generally prohibited. Access involves a scenic but somewhat remote mountain drive, and some baths are seasonal or weather-dependent, so check current conditions before visiting.
Frequently asked questions
Is clothing required at Takaragawa Onsen Osenkaku?
Nudity is required at this location — clothing is not permitted in the nude areas.
Is Takaragawa Onsen Osenkaku family-friendly or adults-only?
Takaragawa Onsen Osenkaku is open to a general audience (all ages welcome).
Is nudity at Takaragawa Onsen Osenkaku officially sanctioned?
This is a private property where nudity is authorised by the operator, subject to their own rules.
Can I visit Takaragawa Onsen Osenkaku for the day?
Access: Day-trip (10:00-14:00) and overnight guests. Day access: Yes.
When is the best time to visit Takaragawa Onsen Osenkaku?
Season: Year-round.
Official links
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