For, behold, I will raise up against you a nation, house of Israel," Says Yahweh, the God of hosts; "And they will afflict you from the entrance of Hamath to the brook of the Arabah."
Moab was bounded on the south by a river, which Isaiah calls “the brook of the willows,” ערבים נחל nachal ‛ârâbı̂ym Isaiah 15:7, across which he foretells that they should transport for safety all which they had of value. A river, now called in its upper part the Wadi-el-Ahsa, and then the Wadi-es-Safieh, which now too “has more water than any south of the Yerka” (Jabbok), “divides the district of Kerek from that of Jebal, the ancient Gebalene” (that is, Moab from Idumaea). This river, after flowing from east to west and so forming a southern boundary to Moab, turns to the north in the Ghor or Arabah, and flows into the south extremity of the Dead Sea . This river then, answering to all the conditions, is doubtless that of which Amos spoke, and the boundary, which Jeroboam restored, included Moab also, (as in the most prosperous times of Israel,) since Moab’s southern border was now his border.