High Quality Content by WIKIPEDIA articles! The Angeles National Forest (ANF) of the U.S. National Forest Service is located in the San Gabriel Mountains of Los Angeles County, southern California. It was established on July 1, 1908, incorporating the first San Bernardino National Forest and parts of the former Santa Barbara and San Gabriel National Forests. It covers 655,387 acres (1,024.0 sq mi; 2,652.3 km2) and is located just north of the metropolitan area of Los Angeles.