On its northern side there are the partly sunken ruins of Dolchiste/Dolikisthe, an ancient town which was destroyed by an earthquake during the 2nd century. Rebuilt and still flourishing during the Byzantine Empire period, it was finally abandoned because of Arab incursions. Tersane (meaning "dockyard", as its bay was the site of an ancient city Xera and dockyard, with the ruins of a Byzantine church) is at the nortwest of the island.

The Kekova region was declared a specially protected area on 18 January 1990 by Turkish Ministry of Environment and Forest. All kinds of diving and swimming were prohibited and subject to special permits from governmental offices. In later years the prohibition has been lifted except for the part where the sunken city is.