The lot for the tribe of the children of Judah according to their families was to the border of Edom, even to the wilderness of Zin southward, at the uttermost part of the south.
"It ran from the lower tip of the Dead Sea southwest to Kadesh-barnea, and thence northwest to the Mediterranean Sea. This was the southern border. The northern border followed the line a traveler would normally follow in going from the northern tip of the Dead Sea (where Jordan enters) to the Mediterranean, Judah's land included all the territory between the Dead Sea and the Mediterranean as restricted by the north and south borders.  This included all the land of the Philistines.  It did not include Jerusalem, but lay south of that city."[1]