Deuteronomy 4:47-51

And they took possession of his land and the land of Og king of Bashan, the two kings of the Amorites, who were across the Jordan to the east,

from Aroer, which is on the edge of the Valley of Arnon, even as far as Mount Sion (that is, Hermon),

with all the Arabah across the Jordan to the east, even as far as the sea of the Arabah, at the foot of the slopes of Pisgah.