Deuteronomy 3:12-13

At that time we took this land to be our own. I gave the people of Reuben and Gad the land from Aroer by the Arnon Ravine, as well as half of the mountain country of Gilead and the cities in it. To the people of East Manasseh I gave the rest of Gilead and all of Bashan, the kingdom of Og. (The area of Argob in Bashan was called the land of the Rephaites.