Rusutsu Resort Onsen Hokkaido

Rusutsu Resort Onsen in Hokkaido draws chloride-rich geothermal waters in a winter sports resort in the Shiribeshi region, where the same volcanic geology of the Niseko-Annupuri-Yōtei volcanic cluster that produces world-class powder snow also drives the geothermal spring system fed by Usu and Yōtei volcanic activity. The resort's thermal complex serves skiers in winter and golfers and cyclists in summer, combining Hokkaido's exceptional seasonal outdoor sports culture with the restorative thermal bathing that has been central to Japanese athletic recovery since the samurai era. The nearby Tōya lake caldera — a UNESCO Global Geopark and the site of Japan's longest-observed active volcanic eruption (Usu volcano 1977–82) where a new mountain Shōwa-Shinzan formed from farmland in 1944 — creates a geological education context for the volcanic forces driving Rusutsu's thermal waters.