Tırtar (formerly: Kumkuyu) is a neighbourhood in the municipality and district of Erdemli, Mersin Province, Turkey.
[3][4] Kumkuyu is a Mediterranean coastal town in the rural area of Erdemli ilçe (district).
It is on the Turkish state highway D.400 which traverses south Anatolia from west to east.
There is a big aqueduct as well as cisterns, rock tanks for olive oil and the ruins of a fort against pirates constructed during Roman Empire.
The residents of Kumkuyu are the members of a former nomadic Turkmen (Oghuz Turk) tribe named Tırtar.