Rancho Potreros de San Juan Capistrano

Los Pinos Peak is a 4,455-foot (1,358 m) summit in the Santa Ana Mountains in Orange County, California, about 8 miles (13 km) east of Rancho Santa Margarita. Los Pinos is the southernmost peak above 4,000 feet (1,200 m) in the Santa Anas, and provides extensive views south towards San Diego and the Pacific Ocean as well as views (on clear days) of the San Jacinto Mountains and San Bernardino Mountains in the east. The summit rises rather prominently above the main crest of the Santa Anas and is conspicuously visible from much of southern Orange County, although its actual topographic prominence is only about 610 feet (186 m).The peak is situated in the Cleveland National Forest and is accessible by the Main Divide Road (a fire road); the Trabuco Canyon Trail, which begins near Trabuco Creek, and the Los Pinos Peak Trail, which begins in Hot Springs Canyon (near San Juan Canyon, San Juan Creek and the Ortega Highway (State Route 74).

Morrell Canyon Creek is a stream or Arroyo, tributary to San Juan Creek, located in the Cleveland National Forest in Riverside County, California, at an elevation of 3,080 ft (939 m), in the Elsinore Mountains northeast of Elsinore Peak. It arises on the eastern slope of San Mateo Peak. An eastern fork draining the Morrell Potrero joins it a little over a mile north of its source and then flows northwestward about a third of a mile where it turns southeast descending the narrow Morrell Canyon east of Lion Spring. After descending 2.5 miles it turns north for half a mile then returns to a southwestern direction for another mile, the canyon widening here until it turns northwestward and down a steep canyon again for half a mile where it takes in from the right Decker Canyon Creek and Long Canyon Creek. It then turns southwestward again into a wider canyon and descends to its confluence with Bear Canyon Creek and becomes the head of San Juan Creek.

El Cariso is an unincorporated community in Riverside County, California. It lies along the Ortega Highway, just west of where it crosses the crest of the Santa Ana Mountains a few miles southwest of Lake Elsinore. It lies within the Trabuco District of the Cleveland National Forest. El Cariso Campground is north of the town across the highway from the El Cariso Fire Station.

Trabuco Peak is a 4,607-foot (1,404 m) summit in the Santa Ana Mountains on the border of Orange and Riverside Counties, California, about halfway between Rancho Santa Margarita and Lake Elsinore. The mountain sits on the divide between Arroyo Trabuco (Trabuco Canyon) on the west and the Temescal Creek valley on the east. Situated in the Cleveland National Forest, it is the highest summit in the Santa Anas south of Santiago Peak.The main trails providing access to the peak, the West Horsethief and Holy Jim trails, both begin at the bottom of Trabuco Canyon. The Main Divide Road, a fire road, also passes close to the peak.

Greystone Villa, Cabin 18, is a historic building located in the Santa Ana Mountains within Cleveland National Forest, in Orange County, Southern California. It is listed in the National Register of Historic Places. It is located near Hot Spring Canyon on the Ortega Highway (California Route 74).

The Holy Jim Volunteer Fire Department (HJVFD) is a group of firefighters in remote "Holy Jim Canyon" in the Cleveland National Forest in Orange County, California. The chief of the department is elected to the position by members of the community and department. The members of the fire department are certified and trained in basic life support and fighting wildfires. The department performs 2 to 3 rescues of lost hikers a year and maintains its own stationhouse, one fire engine, six 5,000 gallon water tanks, a mile of water lines in the canyon and maintains its own weather station gauge at the stationhouse.Orange Coast Magazine featured a four-page article on the firefighters in October 2008.The station house now has only one fire engine. The other engine, Gertrude, was donated to a museum.

The Holy Fire was a wildfire that burned in the Cleveland National Forest in Orange and Riverside Counties, California. The wildfire started on August 6, 2018 at around 1:15 PM PDT, in the vicinity of Trabuco Canyon. A suspected arsonist was booked into the Orange County jail in Santa Ana, California but found not guilty in 2023. The blaze burned 23,136 acres (94 km2) and destroyed 18 buildings, before it was fully contained on September 13, 2018. While the fire was actively spreading in early and mid-August, residents of the nearby cities of Corona, Temescal Valley, and Lake Elsinore were placed under evacuation orders.

Rancho Potrero de la Cienaga is one of the three ranchos that made up the Rancho Potreros de San Juan Capistrano. Its boundary included in the spring watered mountain valley pastures of Round Potrero and Potrero de la Cienaga, in the upper reach of San Mateo Creek in the Santa Ana Mountains in the present day Cleveland National Forest in western Riverside County, United States.

Trabuco Canyon National Forest was established by the U.S. Forest Service in California on July 6, 1907 with 153,387 acres (620.74 km2) when the name was changed from Trabuco Cañon Forest Reserve and land was added. On July 1, 1908 the forest was combined with San Jacinto National Forest to create Cleveland National Forest and the name was discontinued.

Lakeside High School is a public high school located in Lake Elsinore, California and is part of the Lake Elsinore Unified School District. Lakeside High School has been rated as one of the top 10 most beautiful high school campuses in California.

San Mateo Peak is the unofficially named 3,591-foot (1,095 m) peak, at the western end of the ridge running west then northwest from Elsinore Peak to Morrell Canyon, south and west of the Morrell Potrero in the Elsinore Mountains of the Santa Ana Mountain Range. The peak name was given by Sierra Club Lower Peaks Committee Guide, originally named by Ken Croker who for 20 years maintained trails in the Santa Ana Mountains with volunteers from the Sierra Club. It remains officially nameless despite being the highest summit in the Elsinore Mountains, higher than Elsinore Peak, at 3536 ft., the highest named peak in those mountains.San Mateo Creek has its source at an elevation of 2800 feet, in the canyon on the western face of this peak. A fork of Morrell Canyon Creek, a tributary of San Juan Creek, has its source on the northeast face of this peak as do several arroyos descending to the west from the peak into that same creek. An unnamed arroyo, also tributary to San Mateo Creek has its source on the southwest face of ridge descending to the south from this peak.

Aliso Canyon is a 6.5-mile (10.5 km) canyon located in Orange County, California in the United States. The canyon is a water gap across the San Joaquin Hills carved out by Aliso Creek, possibly as recently as the last ice age. Located in a semi-arid climate, it supports a variety of plant communities – mainly chaparral and coastal sage scrub – and native animals, some endangered. The canyon's northern divide once formed a formidable boundary between the indigenous Acjachemen and Tongva. Many Acjachemen archaeological sites have been found in the canyon. The fertile alluvial soil and grasslands of Aliso Canyon was used for orchards and grazing from Spanish conquest of the region until the early 20th century. Since the 1970s, the canyon has been the centerpiece of Aliso and Wood Canyons Wilderness Park. Aliso Canyon has also suffered environmental damage in recent years. Upstream urban development since the 1950s has increased urban runoff into Aliso Creek, causing severe erosion throughout the valley floor. Pollution has also harmed the area's riparian zones. There have been plans to fix these problems, mainly by constructing drop structures to control erosion.