Genesis 13:8

Lot also, who went with Abram, had flocks, herds, and tents.

The land was not able to bear them, that they might live together; for their possessions were so great that they couldn’t live together.

There was strife between the herdsmen of Abram’s livestock and the herdsmen of Lot’s livestock. The Canaanites and the Perizzites lived in the land at that time.

Isn’t the whole land before you? Please separate yourself from me. If you go to the left hand, then I will go to the right. Or if you go to the right hand, then I will go to the left.”

Lot lifted up his eyes, and saw all the plain of the Jordan, that it was well-watered everywhere, before the LORD destroyed Sodom and Gomorrah, like the garden of the LORD, like the land of Egypt, as you go to Zoar.

So Lot chose the Plain of the Jordan for himself. Lot traveled east, and they separated themselves from one another.