Kaunos was a city of ancient Caria and in Anatolia, a few km west of the modern town of Dalyan, Muğla Province, Turkey. The Calbys river (now known as the Dalyan river) was the border between Caria and Lycia. Initially Kaunos was a separate state; then it became a part of Caria and later still of Lycia.
Kaunos was an important sea port, the history of which is supposed to date back till the 10th century BC. Because of the formation of Iztuzu Beach and the silting of the former Bay of Dalyan (from approx. 200 BC onwards), Kaunos is now located about 8 km from the coast. The city had two ports, the southern port at the southeast of Küçük Kale and the inner port at its northwest (the present Sülüklü Göl, Lake of the Leeches). The southern port was used from the foundation of the city till roughly the end of the Hellenistic era, after which it became inaccessible due to its drying out.