A facility known for its blackish-brown natural hot spring, set in an ideal location where you can feel the sound of the Pacific Ocean's waves. The spring water, called Umihibari, gushes up from underground and is a rich sodium-chloride strong brine spring packed with minerals, warming you from the core and helping you stay warm long after bathing. The sauna can be set above 100 degrees, and its powerful heat leaves sauna enthusiasts impressed. Throughout the facility, you can enjoy relaxation that makes the most of the location, including spots in the changing room where you can cool down while looking out at the sea.