The Marmaris Dam is a concrete-face rock-fill dam on the Kocaalan Creek located 10 km (6 mi) north of Marmaris in Muğla Province, Turkey. Constructed between 1998 and 2005, the development was backed by the Turkish State Hydraulic Works as a build-operate-transfer project. The primary purpose of the dam is municipal water supply and it provides Marmaris with 22,390,000 m3 (18,152 acre·ft) of water annually.