Joshua 13:23

“And the border of the children of Reuben was Jordan, and the border [thereof], etc.] As their border eastward was Aroer on the river Arnon, so their border westward was the river Jordan: this [was] the inheritance of the children of Reuben, after their families, the cities and the villages thereof; which Moses gave them on the other side Jordan; and next follow an account of the inheritance of the tribe of Gad in those parts.”

“The writer appends to the command of God Joshua 13:1-7 a statement that the other two tribes and a half had already had their inheritance marked out for them by Moses in the land east of Jordan. The boundaries of this territory as a whole are first set forth Joshua 13:8-14, and afterward the portions assigned within it to the two tribes and a half are severally described Joshua 13:15-33. Joshua 13:14 See Deuteronomy 18:1-5 and notes. Joshua 13:15-24 Inheritance of the tribe of Reuben. This territory was the most southerly of the trans-Jordanic possessions of Israel, and adjoined Moab, which lay only on the other side of the Arnon. Hence, the Reubenites became in after times much intermixed…”

“The border thereof - That is, those cities or places which bordered upon Jordan. Joshua 13:25”

“"And (this) was the boundary of the sons of Reuben, the Jordan and its territory," i.e., the Jordan, or rather land adjoining it. The meaning is, that the territory of Reuben, viz., with the places mentioned last ( Jos 13:20), reached to the territory of the Jordan; for so far as the principal part was concerned, it was on the east of the Dead Sea, as it only reached from the Arnon to Heshbon, i.e., up to the latitude of the northern extremity of the Dead Sea. "The towns and their villages." חצר, farm premises, used, as in Lev 25:31, to denote places not enclosed by a wall. Joshua 13:24”