Ganga Lake (Mongolian: Ганга нуур) is a saltwater lake located in Dariganga sum, Sükhbaatar Province, Mongolia. The lake lies on the transition zone between the southern steppes and the Gobi desert, giving it a unique landscape of lakes, steppes, and sand dunes. The lake and its wetlands (of which the total area is 32.8 km²) is an important breeding and resting area for endangered migratory birds, including the great crested grebe, the whooper swan, and the ruddy shelduck. Due to ongoing climate change, the lake area is shrinking.