Yawatahama Kuroyu Onsen
A natural hot spring that wells up from 950m underground, classified as a so-called mōru spring rich in plant-derived organic matter (iron(II)-sodium-bicarbonate cold mineral spring). This rare water type in the Chugoku-Shikoku region has a faintly dark, slightly blackish turbidity. It is low-irritant and gentle on the skin, earning a reputation as a "beauty spring" that leaves skin smooth. You can fully enjoy its effects in the spacious indoor baths, and its moisturizing and heat-retention benefits continue even after bathing.