Oita Onsen Monogatari Mitsugawa no Yu, located in Mitsugawa Shinmachi, Oita City, is a bathing facility where you can enjoy a rare free-flowing natural hot spring in an urban area. After warming up in the saline chloride spring, you can sweat it out in a spacious high-temperature dry sauna or in a gentle mist sauna. Cool down in a cold plunge bath maintained at 16°C, then relax outdoors in the open-air area.