Deuteronomy 4:47-49

47They took possession of his land and the land of Og king of Bashan, the two kings of the Amorites, who reigned across the Jordan to the east,

48from Aroer, which is on the edge of the valley of the [river] Arnon, as far as Mount Sion (that is, Hermon),

49with all the Arabah (desert lowlands) across the Jordan to the east, even as far as the sea of the Arabah (the Dead Sea), at the foot of the slopes of Pisgah.