Lake Tōya (洞爺湖) is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaidō, Japan. 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. The lakes biggest town, Tōyako Onsen (洞爺湖温泉) is located on its western shore. Lake Tōya is said to be the northernmost lake in Japan that never ices, and the second most transparent lake in Japan. Nakano-shima, an island in the middle of the lake, houses the Tōya Lake Forest Museum. The 2008 G8 Summit was held at Lake Tōya and The Windsor Hotel Toya Resort & Spa [ref]. Below the pictures I took around Lake Toya, including the Windsor Hotel.