Kembos and Eynif structural poljes formed in Quaternary grabens under the control of the tensional neotectonic regime. Waters of the poljes are drained to Manavgat River by underground conduits. Middle Miocene erosional surfaces and Miocene paleovalleys are located on mountains. NW-SE trending tributaries of the Manavgat River developed during Pliocene. Manavgat River incised its valley up to 1229 m after Upper Tortonian.