Deuteronomy 3:12, 13

Of the land that we took over at that time, I gave the Reubenites and the Gadites the territory north of Aroer by the Arnon Gorge, including half the hill country of Gilead, together with its towns.

The rest of Gilead and also all of Bashan, the kingdom of Og, I gave to the half-tribe of Manasseh. (The whole region of Argob in Bashan used to be known as a land of the Rephaites.