Smith's Dictionary
(cool), a torrent-bed or wady in the extreme south of Judah. (1 Samuel 30:9,10,21)
International Standard Bible Encyclopedia
be'-sor, (nachal besor; Codex Alexandrinus, Bechor, Codex Vaticanus, Beana; 1Sa 30:9,20,21; Josephus, Ant, VI, xiv, 6): A torrent-bed (nachal) mentioned in the account of David's pursuit of the Amalekites. Thought to be Wady Ghazza, which enters the sea Southwest of Gaza.