Matsukawa Onsen

Matsukawa Onsen in Hachimantai City, Iwate Prefecture carries a history traced to 1711 to 1735, when the mountain ascetic Ito Sainen reportedly discovered the spring during his spiritual wanderings in the volcanic highlands of former Mutsu Province, with the first formal bathing facility opened in 1743 by Sainen's son Yojiro — a founding narrative typical of Japan's ancient yamabushi hot spring tradition where Buddhist mountain ascetics were the earliest systematic discoverers and guardians of volcanic thermal resources. The spring flows with sulfate-rich thermal waters from the active volcanic geology of the Hachimantai mountain system, one of Tohoku's most geothermally productive volcanic areas, whose broad plateau and multiple spring outlets have made it a region of particular importance in northern Japan's thermal bathing heritage. Matsukawa Onsen's foundation legend, its volcanic mountain setting in the Hachimantai National Park area, and its centuries-long history of serving travelers and pilgrims combine to make it a site of exceptional cultural and geothermal significance in the Iwate onsen tradition.