One of the private hot spring sources that bubbles up on the grounds of Sanga. It is characterized by its slightly blue, transparent water, and is loved under the name Yakushi no Yu for its said benefits for cuts and skin ailments. With a gentle sulfur fragrance, the soft water is kind to the skin and helps relax both body and mind from deep within. In the atmospheric indoor and open-air baths, you can savor the purity of the spring water just as it comes from the source, together with the quiet of the forest.

The other private source is a Skin-Beautifying Spring rich in metasilicic acid. It combines the qualities of a chloride spring and a bicarbonate spring, leaving the skin moisturized long after bathing. The luxury of being able to enjoy two different types of spring water at one inn is what makes Sanga so special. In the naturally rich open-air baths such as Moyai no Yu and Shiki no Yu, guests can experience the blessings of Amakusa with all five senses.