Nishiwaga Onsen

Set in the forested mountains of Nishiwaga, deep in Iwate Prefecture in Japan's Tohoku region, this onsen draws on silica-rich waters that surface at a generous 42 °C. With a near-neutral pH of 7.4, the water is noted for the silky, almost velvety sensation it leaves on the skin — a quality that has made silica onsen a staple of Japanese bathing culture for centuries. The surrounding landscape of beech forests and steep river valleys lends a quietly contemplative atmosphere, typical of the remote inland springs that define Iwate's reputation as one of Tohoku's most rewarding onsen destinations.