Göbekli Tepe ("Potbelly Hill") is a Neolithic sanctuary located 2500 feet above sea level at the top of a mountain ridge in the Southeastern Anatolia Region of Turkey, some 15 kilometers (9 mi) northeast of the town of Şanlıurfa (formerly Urfa / Edessa). The tell has a height of 15 meters and is about 300 meters in diameter. It was first noted in a survey conducted by Istanbul University and the University of Chicago in 1964, which recognized that the rise could not entirely be a natural feature, but postulated that a Byzantine cemetery lay beneath. The survey noted a large number of flints and the presence of limestone slabs thought to be grave markers. The hill had long been under agricultural cultivation; generations of local inhabitants had frequently moved rocks and placed them in clearance piles, possibly destroying much archaeological evidence in the process.