Waterproof, Tear-Resistant, Topographic Map. The Pacific Crest Trail (PCT) covered by this Topographic Map Guide in this part of Southern California leaves the southern reaches of the Sierra Nevada before climbing into the Tehachapi Mountains. As the trail enters the Mojave Desert it crossing the San Andreas Fault Zone. The lower elevations of Southern California are great for hiking in winter, spring, and fall. Summer months, however, can be dangerously hot with infrequent natural water sources. The PCT spans 2,650 miles from the Canadian border, through Washington, Oregon, and California to the southern terminus at the Mexican border. The famous trail crosses some of the most wild and scenic landscapes of the western U.S., including six national parks, 25 national forests, 48 wilderness areas, the volcanic Cascade Range of the Pacific Northwest, the snowcapped Sierra Nevada, and the Mojave and Sonoran deserts. Each PCT Topographic Map Guide includes detailed topographic maps at a s