Camp Pendleton is located 38 miles north of downtown San Diego and including 17 1/2 miles of shoreline along southern California's coast.  The city of Oceanside lies right at the southern boundry of the base followed by Carlsbad, CA at around 6 miles distance.  The city of Fallbrook lies on the eastern boundry of the base with Temecula, and Murietta, CA to the northeast within close proximity.  Going east and then south, you will hit the cities of Vista, San Marcos, and Escondido.