Ōyu Hot Spring
野沢温泉 外湯 大湯のざわおんせん そとゆ おおゆ
Day Use
YesFree entry; donation box (寸志) at entrance to support the local yu-nakama maintenance system
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Dry heat sauna room
Capabilities
Private bath available for day-use visitors or hotel guests to reserve
Shared bathing area for all genders
Policies & Services
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
Relaxation space for after bathing
On-site or nearby parking available
Highlights
Drinking SpringAbout
Oyu (大湯) is the largest and best-known of the 13 communal sotoyu (外湯) in Nozawa Onsen village, and is widely considered the symbol of the village. The bath has been maintained by a local community system called yu-nakama (湯仲間) since the Edo period. Inside are two sulfur-water tubs side by side: atsu-yu (あつ湯), genuinely very hot, and nuru-yu (ぬる湯), somewhat cooler. No rotenburo, no sauna. There is also a drinking spring on the premises. Entry is free, with a donation box at the entrance to support upkeep. Bring your own towel and soap.
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Last updated June 25, 2026