South of Saddleback are Trabuco Peak, ; Los Pinos Peak, and Sitton Peak, . Elsinore Peak, is included in a subrange called the Elsinore Mountains, which are west of Lake Elsinore. San Mateo Peak marks the highpoint of this range. Margarita Peak, ; and Redonda Mesa, are part of the Santa Margarita Mountains, a subrange of the Santa Anas that extends down to Camp Pendleton and Fallbrook. Southeast of the Elsinore Mountains is the Santa Rosa Plateau, named for the Rancho Santa Rosa that once encompassed it. At the south end of the plateau there is a steep escarpment from the basalt capped mesas that line it, that descends from about 500 feet at Mesa de Burro to Sandia Creek on the east to about 1800 feet at Avenaloca Mesa to De Luz Creek in the west. From the foot of the escarpment, the mountains and canyons of De Luz, Sandia Creek and others below it, run to the south to the Santa Margarita River. The range ends roughly at the Santa Margarita River.