Matto Seaside Onsen
A natural hot spring with a sodium chloride spring source. The water has a faint yellow-green tint, contains salt, and is known locally as "netsu no yu" for its ability to warm you from the core. The open-air rock bath lets you soak while listening to the sound of the Sea of Japan's waves, offering a true sense of openness. With its gentle, mildly alkaline texture, the warmth lingers long after you get out, and it is well regarded for its skin-beautifying and fatigue-recovery benefits.