Kanas Lake (Chinese: 喀纳斯湖; pinyin: Kānàsī Hú) is a lake in Altay Prefecture, Xinjiang, China. The lake is located in a valley in the Altai Mountains, near the very northern tip of Xinjiang, and the province's borders with Kazakhstan, Mongolia, and Russia. The lake was formed around 200, 000 years ago during the Quaternary period as a result of glacier movement. The crescent moon shaped lake has an estimated water storage capacity of 53.8 billion cubic meters, coupled with an average depth of around 120 meters. The Kanas River, flowing out of the lake, later merges with the Hemu River to form the Burqin River, which itself discharges into the Irtysh at Burqin Town, the county seat of Burqin County.
There is a large population of Tuvans and Kazakhs in the Kanas valley area. While most of them have maintained their traditional agriculture and nomadic life style, many of the local people also begin to participate in the developing tourism business recent years, managed to establish facilities for orienteering, hiking, rafting, rock climbing, paragliding and camping. The scenic spot is classified as a AAAAA scenic area by the China National Tourism Administration. About 117 different kinds of birds live along the lake.