Smith's Dictionary
(strong), a place named as being on the southern boundary of the Holy Land, apparently near the torrent of Egypt (Wadi el-Arish). (Numbers 34:4,5; Joshua 15:4) It has not yet been identified.
International Standard Bible Encyclopedia
az'-mon (`atsmon; Asemona, "strong"): On the Southwest border of Israel (Nu 34:4,5; Jos 15:4). Trumbull identifies it with `Ain el-Qaseimeh, Northwest of Kadesh Barnea (Kad. Baruch., 117, 289 f).