Baal-Gad
Baal-gad is a Canaanite settlement in the valley of Lebanon, situated under Mount Hermon at the northern edge of the territory Joshua engaged. The name names the place by what stood there before Israel arrived — a local Baal cult site — and the place itself becomes a geographic marker that scripture uses to bound the conquest, define the unconquered remainder, and (by way of the parallel name Baal-hermon) describe the northern reach of Manasseh's settlement.
The Northern Boundary of the Conquest
Joshua's campaign list runs the length of the land. The summary of his southern-to-northern sweep tracks "from mount Halak, that goes up to Seir, even to Baal-gad in the valley of Lebanon under mount Hermon: and all their kings he took, and struck them, and put them to death" (Jos 11:17). The catalogue of defeated kings reverses the same axis: "from Baal-gad in the valley of Lebanon even to mount Halak, that goes up to Seir" (Jos 12:7). Baal-gad and Mount Halak are paired as the two endpoints between which Joshua's conquest is measured.
The Unconquered Land Beyond
The same place that anchors the conquest's northern terminus also anchors the description of the land still to be possessed. When Yahweh enumerates the territory Joshua has not yet taken, Baal-gad reappears in its Hermon-and-Hamath setting: "the land of the Gebalites, and all Lebanon, toward the sunrising, from Baal-gad under mount Hermon to the entrance of Hamath" (Jos 13:5). Baal-gad therefore sits on a hinge — the last point reached, and the first point of what remains.
The book of Judges names the inhabitants of that remaining strip: "the five lords of the Philistines, and all the Canaanites, and the Sidonians, and the Hivites who dwelt in mount Lebanon, from mount Baal-hermon to the entrance of Hamath" (Jud 3:3). The Lebanon-to-Hamath span is the same corridor Joshua had marked, and the locale is named here as Baal-hermon.
Baal-Gad and Baal-Hermon
The two names attach to the same Hermon foothold. Where Joshua 13:5 places Baal-gad "under mount Hermon" en route to the entrance of Hamath, Judges 3:3 places Baal-hermon as the southern marker of the same Lebanon-to-Hamath strip. The Chronicler then uses Baal-hermon to describe the northward expansion of the half-tribe of Manasseh: "And the sons of the half-tribe of Manasseh dwelt in the land: they increased from Bashan to Baal-hermon and Senir and mount Hermon" (1Ch 5:23). The cluster of names — Baal-gad, Baal-hermon, Senir, Hermon — gathers around the same massif at the northern frontier.