'Boundary' in the Bible

To the Reubenites and Gadites I gave the territory from Gilead as far as the Valley of Arnon, with the middle of the Valley as a boundary, and as far as the Jabbok River, the boundary of the sons of Ammon;

the Arabah also, with the Jordan as its boundary, from Chinnereth (the Sea of Galilee) as far as the sea of the Arabah, the Salt Sea (Dead Sea), at the foot of the slopes of Pisgah on the east.