The property within boundaries of District of Koycegiz is located in the face of Dalyan City and on the right shores of Dalyan Stream (Calbis) which connect Koycegiz Lake to Mediterranean. It was the capital of the ‘Kaunos Region’ between the Caria and Lycia until the beginning of the 4th BC.

The existence of Kaunos had known by the scholars but its location was a mystery until English archaeologist Hoskyn discovered it in 1842. Swedish archaeologist P. Roos defined the independent state boundaries of Kaunos as follows: “Starting from the Fethiye Bay at the north and Ancient City of Krya at the north of the bay; extending till Tlos at the 35 km east of Fethiye, Idyma at Gokova Bay at the west and Çamkoy located in the west of Urla which is little forward to north.” In today’s context, the coastal area starting from the south plains of Mugla and extending till the mountains between Mugla and Antalya was under the sovereignty of Kaunos. Kaunos has kept this borders until the 4th century BC but then lost its statue of sovereign state after the Persian invasion. It was one of two cities resisting against Persian invasion (other is Xanthos) such that they paid high taxes to prevailing states many times in order to keep their independency as a port city.