San Gorgonio Wilderness

San Gorgonio Mountain trails

The San Gorgonio Wilderness is located in the eastern San Bernardino Mountains, in San Bernardino County and into northern Riverside County, Southern California. San Gorgonio Mountain, also known locally as Mount San Gorgonio, or Old Greyback, is the highest peak in Southern California and the Transverse Ranges at 11,503 feet (3,506 m).