The loss of the entire trans-Jordanic territory seems to be intended, or at any rate its complete ruin and devastation (compare marginal reference “y”). This was the home of the tribes of Reuben and Gad, and of the half tribe of Manasseh Joshua 22:1-9. It was more accessible from Damascus than the region west of the river.
Aroer - There were several places of this name. The one here mentioned is the most famous (compare Deuteronomy 2:36 note).
Even Gilead and Bashan - The writer had previously called the whole territory “Gilead;” now he distinguishes it, more accurately, into Gilead, the southern, and Bashan, the northern region 1 Kings 4:13, 1 Kings 4:19.