Celaenae (Celænæ) or Kelainai was an ancient city of Phrygia and capital of the Persian satrapy of Greater Phrygia, near the source of the Maeander River in what is today west central Turkey, and was situated on the great trade route to the East.

The Büyük Menderes River, is a river in southwestern Turkey. It rises in west central Turkey near Dinar before flowing west through the Büyük Menderes graben until reaching the Aegean Sea in the proximity of the ancient Ionian city Miletus. The river was well known for its sinuous, curving pattern, and gives its name to the common term used to describe these characteristic bends in rivers.