Charles Ellicott Commentary Jeremiah 48:8

"And the destroyer shall come upon every city, and no city shall escape; the valley also shall perish, and the plain shall be destroyed; as Jehovah hath spoken." — Jeremiah 48:8 (ASV)

The valley also shall perish ... —The cities of the plain are enumerated in Jeremiah 48:21-24. They belonged to the Arabah, the sunken valley of the Jordan, the plains of Moab of Numbers 22:1; Deuteronomy 3:10; Deuteronomy 4:43. The “valley” here is not connected with anything that helps us to identify it, but it may have been that of the Arnon, or the words may be used generically for every valley and every plain.