Genesis 36:6-8

6Now Esau took his wives and his sons and his daughters and all the members of his household, and his livestock and all his cattle and all his possessions which he had acquired in the land of Canaan, and he went to a land away from his brother Jacob.

7For their [great flocks and herds and] possessions made it impossible for them to live together [in the same region]; the land in which they lived temporarily could not support them because of their livestock.

8So Esau lived in the hill country of Seir; Esau is Edom.