1956 Map of Phelan

Southward, the terrain shifts abruptly into the northern reaches of the San Bernardino National Forest, where steep drainages like Cajon Canyon and Horse Canyon descend toward the pass. The local reliance on seasonal water and resource extraction is evident through features such as Sheep Creek, several Reservoirs, and a Quarry located near the forest boundary. At the intersection of mountain and desert routes, Mountain Top Junction marks a key navigational point for travelers entering the Victor Valley.