Kekova Island

Kekova Island, off the Lycian coast near Demre in Antalya province, Turkey, harbors the partly submerged ruins of the ancient settlement of Dolichiste. Earthquakes during the 2nd century CE caused sections of the city to sink below sea level, leaving stone staircases descending into the sea, submerged walls and foundations, and Lycian sarcophagi partially above the waterline. The nearby settlement of Simena (modern Kalekoy) features Byzantine castle ruins overlooking the site. The region was declared a specially protected area in 1990, with swimming and diving prohibited over the ruins.