Tennen Onsen Hachi Hyaku Bō
天然温泉 八百坊てんねんおんせん はちひゃくぼう
Cave-like indoor onsen with non-recirculated spring water in Yamagata city
Day Use
YesClosed on the third Wednesday of each month.
Adults ¥700; children (ages 3–elementary) ¥400. Discounts: ¥550 on the 8th and 26th of each month. JAF discount available.
Bathing & Water
Uses natural hot spring water
Enclosed indoor bathing area
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
Shared bathing area for all genders
Policies & Services
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
On-site or nearby parking available
Highlights
Cave BathAbout
A day-use public bath in Yamagata city with a single indoor hot spring pool and a cold-water bath. Rock sculptures and low lighting give the bath room a cave-like feel. The water runs clear with a faint brownish tint and leaves the skin noticeably smooth.
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Last updated September 19, 2026