and the border went out to the side of Ekron northward; and the border extended to Shikkeron, and passed along to Mount Baalah, and went out at Jabneel; and the goings out of the border were at the sea.
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.