Küçükmenderes River

Cayster River
Cayster near Ödemiş
Origin	Beydağ, Izmir
Mouth	Selçuk, İzmir
Basin countries	Turkey
Length	114 km (71 mi)
Source elevation	220 m (722 ft)
Mouth elevation	0
Avg. discharge	11.45 m3/sec
Basin area	3,502 km2 (1,352 sq mi)

Küçük Menderes, "Little Meander") or Cayster River is located south of İzmir, Turkey. The Cayster generally flows westward and arrive into the Aegean Sea at Pamucak beach near Selçuk, İzmir. The ancient city of Ephesus was once an important port on the Cayster, but over the centuries, sedimentation gradually filled in the inlet around the city. The coastlines moved seaward and the ruins of Ephesus are now some 5 miles inland from the coast.

The tributaries are the Fertek, Uladı, Ilıca, Değirmen, Aktaş, Rahmanlar, Prinçci, Yuvalı, Ceriközkayası, Eğridere, Birgi, Çevlik and Keles.