Cleopatra Island (Sedir Island-Cedrae) is located on the 18 km. north of Marmaris. Cleopatra Island is also known as Sedir Island or City island. Cleopatra island is famous with its golden sandy beach known as Cleopatra Beach and the ancient city of Cedrae. The remnants of the city walls can be seen. It is famous with its huge beach and ancient theatre ruins. There is an interesting beach on the small bay on the northwest of the island where it is believed that Cleopatra used to swim here.
According to the legend, Cleopatra and Antonius used to swim here and the sands have been brought by the ships from North Africa. It's been said that this type of the sand can only be seen in Egypt. The ruins on the east part of the island stands for the era of Romans. Theatre area is in good condition. On the east part of the island there is an Agora. According to some epigraphs, athletics festivals have been organized in this area for the honor of Apollon.