Katsuura Tsuruntsurun Onsen
勝浦つるんつるん温泉かつうらつるんつるんおんせん
Day Use
YesAdults ¥850. Bath unavailable 13:30–14:30 for cleaning. On weekends/holidays last entry 17:15.
Bathing & Water
Open-air outdoor bath
Enclosed indoor bathing area
Uses natural hot spring water
Capabilities
Private bath available for day-use visitors or hotel guests to reserve
Shared bathing area for all genders
Policies & Services
Restaurant or dining open to visitors (not just hotel meal plans)
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
Relaxation space for after bathing
About
The name says it all: "tsuruntsurun" (つるんつるん) means silky smooth, and bathers consistently say their skin feels exactly that way after a soak. The water is a deep amber-brown and leaves a noticeably soft feel on the skin. This small ryokan holds a quiet distinction as the only spring in Chiba listed in Japan's Meito Hyakusen (名湯百選, the 100 famous hot springs). The bath itself is indoor only, cozy enough to feel full with around ten people. The rest area doubles as a gathering spot for locals, and the attached campsite makes it a natural stop for anyone exploring the Boso Peninsula.
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