Albert Barnes Commentary 1 Chronicles 5:23

"And the children of the half-tribe of Manasseh dwelt in the land: they increased from Bashan unto Baal-hermon and Senir and mount Hermon." — 1 Chronicles 5:23 (ASV)

“Baal-Hermon,” “Senir” (Deuteronomy 3:9), and “Mount Hermon” are not so much three names for the one great snow-clad eminence where the Anti-Lebanon range terminates to the south, but rather three parts of the mountain—perhaps the “three summits” at its end.