and the border went up by the valley of the son of Hinnom to the side of the Jebusite southward (the same is Jerusalem); and the border went up to the top of the mountain that lies before the valley of Hinnom westward, which is at the uttermost part of the valley of Rephaim northward;
Ancient Near Easterners used natural landmarks (rivers, mountains, deserts, towns, etc.) to construct borders as well as artificial boundaries that they made by drawing lines between sites. Virtually all nations have used these methods, and they are still common today.