Deuteronomy 3:12-17
And this land, which we possessed at that time, from Aroer, which is by the river Arnon, and half mount Gilead, and the cities thereof, gave I to the Reubenites and to the Gadites.
Torrey's Topical Textbook—AKJV

Joshua 13:23-32
And the border of the children of Reuben was Jordan, and the border thereof. This was the inheritance of the children of Reuben after their families, the cities and the villages thereof.
Torrey's Topical Textbook—AKJV