Campgaw Mountain extends for three miles approximately north to south along the border of Franklin Lakes, Oakland, and Mahwah. The peak of the mountain rises to 752 feet (229 meters) in Mahwah, becoming the fourth highest peak of Watchungs, though the height of the mountain as measured from its base is generally less than 400 feet (122 meters). A shallow gap exists between Campgaw Mountain and the Preakness and Goffle Hill ranges of the Watchungs to the south, somewhat isolating the ridge from the rest of the Watchung Mountains despite contiguous geology below the surface. In the north, the mountain terminates at the Ramapo Fault, the western border of the Newark Basin. Campgaw Mountain also marks the eastern edge of the Ramapo River Valley, forming a sizable basin between itself and the Ramapo Mountains.