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.