760. Kamiyu, Zao Onsen, Yamagata ★★ An old-school onsen for ¥300. The listed hours are 06:00 to 22:00. No staff, no shower. The acidity of the onsen is so strong that even the stool in the changing room seems shocked. Indoor bath. The water is clear and acidic with a bluish tint, and there is lime scale on the bottom. Temperature is 43. Breathing inside is fine, but in January it is cold. A powerful old-school onsen, cold in winter, acidic water, no shower, hot water. Recommended for people who like a harsh atmosphere. 09.01.2026
Kamiyu
蔵王温泉 上湯共同浴場ざおうおんせん うえゆきょうどうよくじょう
Public Bathhouse
Day Use
Yes06:00–22:00
¥300
Adults ¥300, children ¥100. Self-service cashier at the entrance, no staff.
Bathing & Water
Natural onsen water
Uses natural hot spring water
Outdoor BathNo
Open-air outdoor bath
Indoor BathYes
Enclosed indoor bathing area
Capabilities
Mixed BathingNo
Shared bathing area for all genders
Policies & Services
WashingNo
Shower, wash stations, soap and shampoo provided
TowelsNo
Towels available to rent or borrow
Rest AreaNo
Relaxation space for after bathing
ParkingYes
On-site or nearby parking available
About
The largest of the three communal baths (kyodo yokojo, 共同浴場) in Zao Onsen, Kamiyu sits in a wooden building at the top of the resort's main street. Men's and women's sides each have a single indoor tub, fed by a strong acidic sulfur spring that flows through continuously. There are no showers, no soap, and no amenities of any kind. You drop your coins in the unmanned box at the entrance, soak, and leave.
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Last updated July 18, 2026