Lake Kuş or Lake Manyas is a lake in western Turkey, located in the Bandırma region. It is a shallow nutrient-rich freshwater lake fed by groundwater and four streams. Small deltas have formed where the latter enter the lake, comprising extensive marshes and tree-lined riverbanks. Narrow belts of reed Phragmites fringe much of the lake. Water is abstracted for factory use and for irrigation. Cattle and sheep grazing are common along the lake shores.