(roaring), the river or torrent which formed the boundary between Moab and the Amorites, on the north of Moab (Numbers 21:13-14, 24, 26; Judges 11:22), and afterwards between Moab and Israel (Reuben). (Deuteronomy 2:24, 36; 3:8, 12, 16; 4:48; Joshua 12:1-2; 13:9, 16; Judges 11:13, 26) There can be no doubt that the Wady el-Mojeb of the present day is the Arnon. Its principal source is near Katrane, on the Haj route.