Lake Toya
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Lake Tōya (洞爺湖 Tōya-ko) is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaido, Japan. The main town is Tōyako Onsen (洞爺湖温泉), on the western shore.
There is also a smaller village called Toya-mura on the other side of the lake.
Lake Tōya is said to be the northern-most 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.