The Santa ANA Mountains are a mountain range located in Southern California, near the city of Santa ANA. The range is part of the Peninsular Ranges System and extends for approximately 40 miles from the Santa ANA River to the San Jacinto Mountains. The highest peak in the range is Santiago Peak, which stands at 5, 689 feet. The Santa ANA Mountains are home to a variety of wildlife, including mountain lions, bobcats, coyotes, and mule deer. The range is also home to several endangered species, such as the California gnatcatcher and the Quino checkerspot butterfly. The Santa ANA Mountains are a popular destination for hikers, campers, and other outdoor enthusiasts.