Büyük Menderes River
Aydın ( "EYE-din"; ; formerly named "Güzelhisar"), Ancient and Modern Greek Τράλλεις /"Tralleis/," is a city in and the seat of Aydın Province in Turkey's Aegean Region. The city is located at the heart of the lower valley of Büyük Menderes River (ancient Meander River) at a commanding position for the region extending from the uplands of the valley down to the seacoast. Its population was 207,554 in 2014.