The land was not able to bear them The Canaanites and other former inhabitants of the country undoubtedly occupied the best of the land, and what remained was not sufficient to supply their flocks and herds with pasturage.
Related Commentaries of Genesis 13:6
Genesis 13:6
6 And the land was not able to bear them, that they might dwell together: for their substance was great, so that they could not dwell together.