Sforno on Genesis 13:11/ספורנו על בראשית י״ג:י״א

1ויבחר לו לוט, he selected as much area as he himself with his shepherds would manage to control as their grazing land. In this section of the earth Avram and his shepherds would not be allowed to graze.

2ויסע לוט מקדם, he did not turn right or left which were north and south, but he moved from the east to the west to distance himself from Avram [the author translated מקדם as meaning “from the east,” though this is difficult to reconcile with the fact that the Jordan valley is east from the region of Bet El and Ai where Avram and Lot had been reported last in verse 3. The area of the Jordan valley was the area from which the Israelites under the leadership of Joshua would enter the land of Canaan (Joshua chapter 4)