Lake Tōya 洞爺湖 is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaidō, Japan. It is a part of Toya Caldera and Usu Volcano Global Geopark. The stratovolcano of Mount Usu lies on the southern rim of the caldera. The lake is nearly circular, being 10 kilometers in diameter from east-west and 9 kilometers from North-South. MT Usu 有 珠 山 volcano is a Hokkaido of Japan's most famous volcanoes. The summit of Usu consists of several volcanic cones. The last eruption was in March 2000 -
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