Joshua 13:25

And their coast was Jazer, and all the cities of Gilead, and half the land of the children of Ammon, unto Aroer that is before Rabbah;

Their coast was Jazer, х Ya`ªzeer (H3270)] (Numbers 32:1; Numbers 32:3) - Jaazer (Numbers 21:32; Numbers 32:35) and [Ya`ziyir], Jaeseir. The historian passes on to the territory of the Gadites. It was a town in Gilead (Numbers 32:1; 1 Chronicles 26:31) conquered by Moses (Numbers 21:32), assigned to the Gadites (Numbers 32:35) and afterward appropriated to the Levites (Joshua 21:39; 1 Chronicles 6:66). It is supposed by Seetzen and others to have stood on the site of the ruins called Szyr, about fifteen miles from Heshbon (see the note at Numbers 32:35).

And all the cities of Gilead - i:e., the southern part of Gilead (see the note at Joshua 13:31).

And half the land of the children of Ammon - i:e., what of the Ammonite territory lay between the Arnon and the Jabbok.

Unto Aroer that is before Rubbah. Rabbah was the Ammonite metropolis (Deuteronomy 3:11; Judges 11:33; 2 Samuel 24:5). 'Aroer before Rabbah,' in the territory of Gad, was quite distinct from the Aroer belonging to the Reubenites, which was "in the midst of the river," or wady.