and the border turned about from Baalah westward to Mount Seir, and passed along to the side of Mount Jearim on the north (the same is Chesalon), and went down to Beth-shemesh, and passed along by Timnah;
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.