It is a wadi located on the border between the Egyptian and Israelite regions.
Josh 13:3from the Shihor River, which is east of Egypt, northward to the territory of Ekron, which belongs to the Canaanites, and the land of the five rulers of the Philistines—the Gazites, Ashdodites, Ashkelonites, Gittites, and Ekronites—and also the land of the Avvites to the south;
Josh 19:26Alammelech, Amad, and Mishal. On the west, the boundary touched Carmel and Shihor-Libnath.
1 Chr 13:5So David assembled all Israel, from the Shihor of Egypt to Lebo Hamath, to bring the ark of God from Kiriath-Jearim.