Santiago Peak  in Rancho Santa Margarita, California, is the southernmost mountain of the Saddleback landform in Orange County, California, and is the highest point in the region. Moreover, it is the highest and most visible peak in both the Santa Ana Mountains and Orange County, and it also serves as a border crossing point between Orange and Riverside counties. Santiago Creek Margarita, which originates on the peak’s southwestern side, is the source of the peak’s name. Snow does fall on the summit during the winter months. On top of the mountain, there is a telecommunications antenna farm with microwave antennas.

The road to the summit of Mount Whitney, which is located high in the Santa Ana Mountains within the Cleveland National Forest, is completely unpaved. The trail is known as the Main Divide Truck Trail.

There are a number of trails that lead to the summit of Santiago Peak, but the Holy Jim track is the most popular with hikers and mountain bikers since it is the most scenic. The Holy Jim trail rises around 4,000 feet (1,200 meters) in elevation and is approximately 16 miles (26 kilometers) round way. It is a moderate to tough hike that is most enjoyable during the spring and winter months because of the enormous number of insects that are present during the warmer months of the year throughout the summer. It also has a waterfall and is considered as challenging to complete.

From the summit of Santiago Peak, one can see the larger peaks of Southern California, such as San Gorgonio Mountain, San Jacinto Peak, and Mount San Antonio, as well as the Pacific Ocean. However, due to the enormous number of antennas at the summit of Santiago Peak, it is not possible to have a full 360-degree view of the surrounding landscapes from there. If you want to see everything from every perspective, you’ll have to go around the circumference of all of the antennas, which will take you about a quarter-mile.

It is a radio site containing structures owned by a variety of entities, including American Tower, Crown Castle, MobileRelay Associates, Day Wireless, Orange County Communications, the United States Government, the State of California, and Southern California Edison, among others.

In addition to Los Angeles and Orange counties, Santiago Peak provides radio coverage for parts of San Bernardino, Riverside, and San Diego counties. This facility has both broadcast and two-way communications capabilities on practically every frequency band, including FM broadcast, VHF low- and high-band, UHF, 800/900 MHz, and microwave, amongst other frequencies.