Tsurunoyu Onsen, Onsen in Semboku, Japan
Tsurunoyu Onsen is a traditional inn set deep in the forested mountains of the Nyuto Onsen area in Semboku, Akita Prefecture. It has four spring sources, offering a mix of sulfur and hydrogen carbonate waters across both outdoor and indoor baths.
Tsurunoyu is the oldest inn in the Nyuto Onsen group, with records pointing to use by a local lord who came here seeking treatment. The thatched-roof building that once housed his guards still stands on the grounds today.
Tsurunoyu has maintained a mixed-gender outdoor bath, known in Japanese as konyoku, where men and women soak together in the same pool. This practice has largely disappeared from modern onsen, making it a living example of an older bathing tradition.
The access road to Tsurunoyu is a narrow gravel track that winds through the forest and can be rough after bad weather. Visitors should bring their own towels, as they are not provided, and it is worth reading up on basic onsen etiquette before arriving.
Tsurunoyu has a utaseyu, a bath where water falls from above onto bathers' shoulders like a small waterfall, which is a traditional form of water treatment rarely found in everyday onsen. There is also no mobile phone reception in the area, which many guests see as part of the experience rather than an inconvenience.
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