פירוש על בראשית 13:11

ככר The word means “a plain” as the Targum translates it.

ויבחר 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.

ויבחר לו לוט את כל ככר הירדן, the reference is to one area within the Jordan valley, the use of the word כל here meaning that all the areas within that region were equally good as grazing land for his flocks.