The Amalekites dwell in the land of the south - Their territory lay between the Dead and the Red Seas, skirting the borders of Canaan.
Hittites ... dwell in the mountains - Their settlements were in the southern and mountainous part of Palestine (Gen 23:7).
the Canaanites dwell by the sea - The remnant of the original inhabitants, who had been dispossessed by the Philistines, were divided into two nomadic hordes - one settled eastward near the Jordan; the other westward, by the Mediterranean.