Abstract: There are 4296 lakes in Mongolia with an area of more than 0.003 km2 and a total surface area of 15,514.7 km2.According to size of water surface area, Mongolia lakes classified in to 10 classes such as Great lakes (above 1000 km2), Big lakes (500-1000 km2) large lakes (100-500 km2), medium lakes (20-50 and 50-100 km2), small (1.0-5.0 and 5-10 km2) little (1.0-5.0 km2) and very little (0.1-1.0 km2) etc [2].