The valley - The lowlands on the east bank of the Jordan, and at the top of the Dead Sea.
The plain - An upland pasture; it answers very much to downs: so in Jeremiah 48:21.
Related Commentaries of Jeremiah 48:8
Jeremiah 48:8
8 And the spoiler shall come upon every city, and no city shall escape: the valley also shall perish, and the plain shall be destroyed, as the LORD hath spoken.