That goeth up to Seir i.e. to the country of Seir or Edom, to wit, that part of it which was south from Judea, not that which was eastward from it, as appears from hence, that here, as also Joshua 12:7, is mention of the two extreme bounds of the land conquered by Joshua; whereof the other which follows being in the north, this must needs be in the south of the land. Baal-gad; a part of Mount Lebanon.
Related Commentaries of Joshua 11:17
Joshua 11:17
17 Even from the mountc Halak, that goeth up to Seir, even unto Baalgad in the valley of Lebanon under mount Hermon: and all their kings he took, and smote them, and slew them.