The Angeles National Forest (ANF) was establishe by executive order on December 20, 1892 as the San Gabriel Timberland Reserve. It covers 655,387 acres (1,024.0 sq mi/2,652.3 km²) and is located in the San Gabriel Mountains of Los Angeles County, just north of the metropolitan area of Los Angeles, California. A small part extends eastward into southwestern San Bernardino County, in the Mount San Antonio ("Mount Baldy") area. A tiny section also extends westward into northeastern Ventura County, in the Lake Piru area. Forest headquarters are in Arcadia, California. The Angeles National Forest manages the watersheds within its boundaries to provide valuable water to Southern California and to protect surrounding communities from catastrophic floods.