Origin

The Origin is a viewing area within the Park where guests can see the natural hot spring source, and it marks the starting point of Riyuegu's hot spring system. Thermal water emerges here from deep underground at 82°C, a natural combination of silicic acid and chloride springs. Its levels of fluorine, strontium, and silicic acid each exceed the Medicinal Value Classification standards, a formal grading system for mineral hot spring water. In East Asian hot spring culture, springs of this mineral profile are traditionally known as "beauty springs" (美人汤).