Shur
    an enclosure; a wall, a part, probably, of the Arabian desert,
    on the north-eastern border of Egypt, giving its name to a
    wilderness extending from Egypt toward Philistia (Gen. 16:7;
    20:1; 25:18; Ex.15:22). The name was probably given to it from
    the wall (or shur) which the Egyptians built to defend their
    frontier on the north-east from the desert tribes. This wall or
    line of fortifications extended from Pelusium to Heliopolis.



 Shur, wall; ox; that beholds