POI's creator (Voyajo Team)
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. It is a nearly circular lake with 10 kilometers diameter in the east-west direction and 9 kilometers in the north-south direction (...) (from Wikipedia)