There is a group of rock-cut monasteries along the Karasu Stream south of İnceğiz, a village in Çatalca/Istanbul. They are located in the limestone outcrops on the south side of the Karasu valley. The first monastery is located around 500 m south of İnceğiz. It has three floors, with stables on the ground floor. The next floor is centered on a cruciform church. It has two side chapels and a cross carved in the ceiling. A rock-cut staircase leads to the upper floor. A fourth cave with traces of wall paintings is also at the top of the cliff. Two more groups of cave monasteries, located about 1.5 km to the west, are less well preserved.

İnceğiz was located on the road running from Metrai (modern Çatalca) to Sergentzion (modern Binkılıç) and Saray. In 1373, İnceğiz was brutally conquered by Murad I after its inhabitants put up fierce resistance. Its Byzantine name is unknown, though it has been suggested it is Ad Statutas on the Peutinger Map.