Jamieson, Fausset and Brown on Ezekiel 29:10

10. from the tower of Syene--Grotius translates, "from Migdol (a fortress near Pelusium on the north of Suez) to Syene (in the farthest south)"; that is, from one end of Egypt to the other. So "from Migdol to Syene," Eze 30:6, Margin. However, English Version rightly refers Syene to Seveneh, that is, Sebennytus, in the eastern delta of the Nile, the capital of the Lower Egyptian kings. The Sebennyte Pharaohs, with the help of the Canaanites, who, as shepherds or merchants, ranged the desert of Suez, extended their borders beyond the narrow province east of the delta, to which they had been confined by the Pharaohs of Upper Egypt. The defeated party, in derision, named the Sebennyte or Lower Egyptians foreigners and shepherd-kings (a shepherd being an abomination in Egypt, Ge 46:34). They were really a native dynasty. Thus, in English Version, "Ethiopia" in the extreme south is rightly contrasted with Sebennytus or Syene in the north.