Takaragawa Onsen (宝川温泉)
다카라가와 온천 (宝川温泉)
Japan's largest open-air onsen
About this place
NotesFounded in 1923, a mountain lodge in Gunma. Riverside baths among Japan's largest are breathtaking. 70°C spring, 1,800 L/min free-flowing (kakenagashi).
Practical notes
Established in 1923. Japan's largest mixed-gender outdoor onsen. Featured in Thermae Romae II film. 4 massive outdoor baths along Takaragawa stream (470 tatami total). Bathing wear (yuami-gi) required for mixed baths (included). Day use ¥1,500 (10:00–16:00). Overnight stay from ¥32,800/2 people. Free shuttle from Jomo-Kogen and Minakami stations. Winter snow tires essential.
Compiled from publicly available information and visitor reports. The rating shown is an editorial summary of the same, and does not mean we have visited every place in person. Prices and hours may change — please confirm with the venue before visiting.
Before you go
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Info updated: 2026-08
Details may differ from actual conditions.
What stands out
- +470 tatami—Japan's largest outdoor bath
- +Mandatory bath dress, beginner-friendly
- +100% free-flowing spring water
- +Open year-round
- +Free shuttle bus
Facility Details
Est. 1923. Japan's largest mixed outdoor onsen, 4 baths (470 tatami). Thermae Romae II location.
Baths
5120 tatami, mixed, built 1940
200 tatami, mixed, largest
50 tatami, mixed
100 tatami, women only
Facility details are verified and updated regularly, but may differ from actual conditions. Please confirm with the venue before visiting.
Japan's largest mixed-gender outdoor onsen with 4 giant baths totaling 470 mats
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