Alameda (island)

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Alameda Island

Aerial view of the north end of Alameda Island (left), with Oakland on the right and San Francisco in the background
Geography
Location	San Francisco Bay, California
Coordinates	37°46′36″N 122°16′40″W / 37.77667°N 122.27778°W / 37.77667; -122.27778
Coastline	9.25 km (5.748 mi)
Administration
United States
State	California

Alameda Island is an island located in the San Francisco Bay in California. It is south and west of, and adjacent to, Oakland, and across the bay eastward from San Francisco. Located on the island is most of the city of Alameda, a city in Alameda County. A very small western tip of the island's territory is technically part of San Francisco, however, this is uninhabited and is not separately managed. Alameda Island is the most populated island in the continental United States that is not located in the New York City metropolitan area.

Once located on the island was the Naval Air Station Alameda, a defunct naval air station. The island was originally a peninsula and a part of Oakland and is now separated from the mainland by the Oakland Estuary. The island is connected to the mainland by six bridges: the Park Street Bridge, the Fruitvale Railroad Bridge, the Miller Sweeney Road Bridge, the High Street Bridge, the Bay Farm Island Bridge, and the Bayfarm Island Bicycle Draw Bridge. The Posey and Webster Street tubes also connect Oakland to Alameda Island.