“Mount Halak.” This could be a mountain on the south border of the Promised Land, but that is an educated guess. But this is in the south of the Promised Land. To go from Mount Halak to Seir, you have to go down then back up.
“even to Baal-gad in the valley of Lebanon under Mount Hermon.” This is in the far north of the Promised Land. Baal-gad has not yet been conclusively identified, but it must be up in the Baka Valley (of Lebanon). It is mentioned three times (Josh. 11:17; 12:7; 13:5), each time to mark the northwestern boundary of the land of Canaan.