Lake Tōyacrater lake in Hokkaido, Japan / From Wikipedia, the free encyclopedia Lake Tōya (洞爺湖, Tōya-ko) is a Japanese lake in Shikotsu-Toya National Park on the island of Hokkaidō, Japan. Lake Toyako, September 2013
Lake Tōya (洞爺湖, Tōya-ko) is a Japanese lake in Shikotsu-Toya National Park on the island of Hokkaidō, Japan. Lake Toyako, September 2013