Achit Lake (; ) is a freshwater lake in Bayan-ÃÂlgii Province and Uvs Province, Mongolia, in the west of the country. At an elevation of 1,435 m above sea level it covers an area of 290 km<sup>2</sup>. It is 28 km long, 16 km wide, and 10 m deep. The coast is covered with steppes, mostly hilly but swampy on the northwest and northeast. Several rivers flow into the lake.