Rich in active gases or metals — a strong mineral character.
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Standard buoyancy
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Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Roadside station Osumi Yagorodensetsu no sato in Soo City, Kagoshima, draws its name from the Yagoro-don legend—the story of a legendary giant said to have inhabited the Osumi region of ancient Kagoshima, whose enormous size and supernatural powers made him a figure of both fear and reverence in the folk traditions of this southernmost corner of the Japanese mainland. This michi-no-eki (roadside station) on National Route 269 combines the Japanese tradition of highway rest facilities—where drivers find local food, regional crafts, and thermal bathing—with the Osumi area's unique folkloric heritage of the giant Yagoro, placing mythology at the heart of the traveler's rest stop. The spring facility embedded in the roadside station allows travelers on the Kagoshima highway to pause for the thermal restoration that Japan's roadside spring culture has offered since the earliest days of onsen-adjacent travel on the Osumi Peninsula.
Insider tip — This roadside rest facility in the Osumi region of Kagoshima incorporates natural hot spring baths fed by the geothermally active Kyushu volcanic belt. The sulfurous waters are characteristically warm and aromatic, offering motorists and cyclists a restorative stop between Kagoshima city and the Kirishima mountains. The Osumi plateau is rich in legends tied to Japan's Kojiki mythology, making the surrounding landscape historically evocative. Sakurajima volcano looms on the western horizon on clear days.