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Oniishi-no-yu is a day-trip bathing facility located in Kannawa (one of the most fertile hot spring areas in Japan, famous for its 'Jigoku Meguri' ('hell tour)).
Indoor baths, open-air baths and baths with a view are available.
As sodium chloride spring, the spa water that flows out is weakly acidic and rich in metasilicic acid - known for its excellent moisturising effect on the skin.