Deuteronomy 3:17 (ESV)

17 the Arabah also, with the Jordan as the border, from Chinnereth as far as the Sea of the Arabah, the Salt Sea, under the slopes of Pisgah on the east.

In this verse that concludes the description of the allocation of land east of the Jordan River, details are given regarding the western border of the tribes in that area. The Arabah was the western border, Chinnereth was the northern limit, and the Salt Sea the southern limit.