Numbers 22:1

Plains. Septuagint, "to the west of Moab." These plains had formerly belonged to that people, but the Hebrews had lately taken them from Sehon, and intended now to pass over the Jordan. The Moabites, however, being jealous of their growing power, called in the aid of the Madianites, and of the magician Balaam, and, by their wanton provocation, brought destruction upon themselves. We know not exactly the extent of the dominions of the Moabites. They seemed to have lost the greatest part of the country north of the Arnon. Their last town and capital was Ar, chap. xxi. 13. Yet they still kept possession of Mount Phasga. (Calmet)