In Southern California, the city of Los Angeles alone covers more than 500 square miles. Yet beyond the freeways and suburbia, there is a surprising amount of hikeable green space and wilderness. This new guide details trails in the Santa Monica Mountains National Recreation Area, the world's largest urban national park stretching from the Pacific Coast right into Hollywood itself; the Santa Susana Mountains in Los Padres National Forest; Angeles National Forest, including the San Gabriels and Mount San Antonio, the highest point in Los Angeles County; the striking desert landscape of Antelope Valley; the Santa Ana Mountains; portions of the San Bernardino Mountains; Chino Hills State Park; and slivers of green space and city parks such as famed Griffith Park.