Deuteronomy 3:8-12

8And we took at that time out of the hand of the two kings of the Amorites the land that was on this side of Jordan, from the river of Arnon to mount Hermon; 9(Which Hermon the Sidonians call Sirion; and the Amorites call it Shenir;) 10All the cities of the plain, and all Gilead, and all Bashan, to Salchah and Edrei, cities of the kingdom of Og in Bashan. 11For only Og king of Bashan remained of the remnant of giants; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length of it, and four cubits the breadth of it, after the cubit of a man.

12And this land, which we possessed at that time, from Aroer, which is by the river Arnon, and half mount Gilead, and its cities, I gave to the Reubenites and to the Gadites.