The Santa Margarita Mountains are a mountain range, part of the larger Santa Ana Mountains, in coastal San Diego County, California. They are bounded on the northwest by San Mateo Creek, on the northeast by Teneja Canyon Creek, on the east by De Luz Creek and on the south by Las Pulgas Canyon. On the southwest they descend into the coastal foothills in the Marine Corps Base Camp Pendleton. Its highest summit is Margarita Peak at an elevation of 3136 feet.  Margarita Lookout lies in the northern part of the subrange.