To Caleb the son of Jephunneh he gave a portion among the children of Judah, according to the commandment of Yahweh to Joshua, even Kiriath Arba, [which Arba was] the father of Anak (the same is Hebron).
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.