Charles Ellicott Commentary Jeremiah 48:21

"And judgment is come upon the plain country, upon Holon, and upon Jahzah, and upon Mephaath," — Jeremiah 48:21 (ASV)

And judgment is come upon the plain country ... —We enter here upon a list of less known names, of which Jahaz, Beth-diblathaim, Beth-Baal-meon are found on the Moabite Stone inscription (Records of the Past, xi. 165-168).

Holon does not appear elsewhere. Jahazah (under the form Jahaz) appears in Numbers 21:23; Deuteronomy 2:32; Judges 11:20, as the scene of a famous battle between Sihon and the Israelites, and in Isaiah 15:4 in connection with Heshbon and Elealeh.

Mephaath was assigned to the Reubenites (Joshua 13:18), and afterwards to the Levites (Joshua 21:37; 1 Chronicles 6:79), but it had clearly fallen afterwards into the hands of the Moabites. Like the other cities named, it was in the Mishor, or “plain,” on the north of the Arnon.