Semboku, Akita, Japan
350-year-old hidden onsen in Akita.
Info updated: 2026-03
Details may differ from actual conditions.
Oldest secret spring in Nyuto. 4 completely different springs within 50m. 100+ year thatched roofs.
Baths
6Milky white, beauty water, no towels
58.7°C source, warming bath
45.1°C, for fatigue & eye conditions
51.7°C, waterfall style, closed in winter
Special Facilities
2Mountain cuisine around hearth in thatched-roof building
7-onsen pass ¥2,500 (guests only)
Facility details are verified and updated regularly, but may differ from actual conditions. Please confirm with the venue before visiting.
A secret bath where you can stay in 400-year-old National Cultural Property buildings
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