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Büyük Menderes, also known as the Maeander River, is a river in western Turkey, notable for its meandering course that gives rise to the term "meander" itself. Originating from the Taurus Mountains, the river flows through the Aydın province and discharges into the Aegean Sea. The lower valley of Aydın is thus situated along the fertile plains formed by the Büyük Menderes River, known for its agricultural and historical significance.