Quote: Noboribetsu is a city in Iburi subprefecture, Hokkaido, Japan. Part of Shikotsu-Toya National Park, it is southwest of Sapporo, west of Tomakomai and northeast of Hakodate. The name, Noboribetsu, derives from an Ainu word, nupur-pet, which means dark-coloured river (the kanji ?? are used for their phonetic value only, and have no relation to the original meaning). Lake Toya is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaido, 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 lake's biggest town, Toyako Onsen is located on its western shore. The town Toyako is located on the other side of the lake.