The Presidio is an the adjacent area to the Golden Gate Bridge in San Francisco, on Earth. Starfleet Academy and the Starfleet Command Headquarters have their respective sees in this area. (VOY: "Endgame")
The Presidio preserves an astonishingly complex cultural and natural heritage within its 1480 acres. For thousands of years, Native Americans called the Ohlone managed and harvested the natural bounty of what is now the Presidio. In 1776, Spanish soldiers and missionaries arrived, forever disrupting Ohlone culture and beginning 218 years of military use of the area just south of the Golden Gate.
The Presidio served as a military post under the flags of Spain (1776-1822), Mexico (1822-48), and the United States (1848-1994). As a U.S. Army post, the Presidio protected commerce and trade, and played a logistical role in every major U.S. military conflict from 1848 until closure. World events and those on the home front - from military campaigns to the rise of aviation, from World Fairs to natural disaste
On October 1, 1994, the Presidio became part of the Golden Gate National Recreation Area.