San Francisco Bay Area
For the Farallon Islands, see List of islands of California#Farallon Islands. For islands in the Sacramento River Delta, see List of islands of California#Sacramento-San Joaquin River Delta. For islands in Suisun Bay, see List of islands of California#Suisun Bay.Other islands of the Bay Area:
| Island | Image | Coordinates | Counties | Description |
|---|---|---|---|---|
| Alameda Island | 37°45′55″N 122°14′30″W / 37.76528°N 122.24167°W / 37.76528; -122.24167 (Alameda Island) | Alameda, San Francisco (small, uninhabited sliver) | This 6-mile (9.7 km) long island in San Francisco Bay is the main part of the City of Alameda. | |
| Alcatraz Island | 37°49′36″N 122°25′24″W / 37.8266°N 122.4233°W / 37.8266; -122.4233 (Alcatraz Island) | San Francisco | This 22-acre (8.9 ha) island in San Francisco Bay once served as a lighthouse, a military fortification, a military prison, and as a federal prison until 1963. It is now part of the Golden Gate National Recreation Area. | |
| Angel Island | 37°51′46″N 122°25′51″W / 37.862778°N 122.430833°W / 37.862778; -122.430833 (Angel Island) | Marin | With an area of 1.2 square miles (3.1 km2), this island in San Francisco Bay processed approximately 1 million immigrants to the U.S. during 1910 to 1940. It is currently a state park. | |
| Año Nuevo Island | 37°06′31″N 122°20′16″W / 37.1085588°N 122.3377509°W / 37.1085588; -122.3377509 (Año Nuevo Island) | San Mateo | Small Pacific island, about 0.2 miles (0.32 km) long, near Año Nuevo (New Year's) Point, south of the Golden Gate. It is protected by the Año Nuevo State Reserve as an important habitat for seabirds and other coastal wildlife. | |
| Bair Island | 37°31′48″N 122°13′20″W / 37.5299362°N 122.2221881°W / 37.5299362; -122.2221881 (Bair Island) | San Mateo | This 2,600-acre (1,100 ha) island in San Francisco Bay near Redwood City is part of the Don Edwards San Francisco Bay National Wildlife Refuge. | |
| Bay Farm Island | 37°44′17″N 122°15′07″W / 37.738°N 122.252°W / 37.738; -122.252 (Bay Farm Island) | Alameda | This former island in San Francisco Bay has been connected to the mainland. It is part of the City of Alameda. | |
| Belvedere Island | 37°52′18″N 122°28′07″W / 37.87158°N 122.46849°W / 37.87158; -122.46849 (Belvedere Island) | Marin | This former island in Richardson Bay has been connected to the mainland. It is part of the City of Belvedere. | |
| Bird Island | 37°49′27″N 122°32′12″W / 37.8240950°N 122.5366415°W / 37.8240950; -122.5366415 (Bird Island) | Marin | Small Pacific island between Point Bonita and Rodeo Cove. | |
| Bird Rock | 38°13′48″N 122°59′40″W / 38.2299191°N 122.9944445°W / 38.2299191; -122.9944445 (Bird Rock) | Marin | Small Pacific island west of Tomales Point, primarily a seabird colony. It covers 2 acres (0.81 ha). | |
| Brooks Island | 37°53′47″N 122°21′19″W / 37.89639°N 122.35528°W / 37.89639; -122.35528 (Brooks Island) | Contra Costa | A 65-acre (26 ha) island in San Francisco Bay south of Richmond, protected as part of the Brooks Island Regional Shoreline. | |
| The Brothers | 37°57′48″N 122°25′59″W / 37.96333°N 122.43306°W / 37.96333; -122.43306 (Brother Islands) | Contra Costa | Two small islands, East Brother and West Brother, located west of Point San Pablo. Each is about 300 feet (91 m) long. East Brother has a lighthouse and a bed and breakfast. | |
| Castro Rocks | 37°55′56″N 122°25′07″W / 37.93222°N 122.41861°W / 37.93222; -122.41861 (Castro Rocks) | Contra Costa | Beneath the Richmond – San Rafael Bridge. | |
| Coast Guard Island | 37°46′56″N 122°15′00″W / 37.78222°N 122.25°W / 37.78222; -122.25 (Coast Guard Island) | Alameda | Located in the Oakland Estuary, this 67-acre (27 ha) artificial island is part of the City of Alameda. It is home to various United States Coast Guard facilities. | |
| Corinthian Island | 37°52′22″N 122°27′32″W / 37.87278°N 122.45889°W / 37.87278; -122.45889 (Corinthian Island) | Marin | This former island was joined to the mainland in the 1980s. It is split between the city of Belvedere and the town of Tiburon. | |
| East Marin Island | 37°57′52″N 122°28′06″W / 37.96444°N 122.46833°W / 37.96444; -122.46833 (East Marin Island) | Marin | Near San Rafael, California. | |
| Gull Rock | 37°52′34″N 122°36′59″W / 37.8760378°N 122.6163689°W / 37.8760378; -122.6163689 (Gull Rock) | Marin | A Pacific island near Mount Tamalpais, about 200 feet (61 m) long. | |
| Hog Island (Petaluma River) | 38°09′33″N 122°32′18″W / 38.1590851°N 122.5383142°W / 38.1590851; -122.5383142 (Hog Island (Petaluma)) | Sonoma | Island in the Petaluma River wetlands. | |
| Hog Island (Tomales Bay) | 38°11′50″N 122°56′09″W / 38.1971423°N 122.9358306°W / 38.1971423; -122.9358306 (Hog Island (Tomales)) | Marin | A 2-acre (0.81 ha) island in Tomales Bay. | |
| Kent Island | 37°54′44″N 122°40′43″W / 37.912148°N 122.6785951°W / 37.912148; -122.6785951 (Kent Island) | Marin | An island in Bolinas Lagoon, near the town of Bolinas. About 0.5 miles (0.80 km) long. | |
| Mare Island | 38°05′44″N 122°16′21″W / 38.0954755°N 122.2724704°W / 38.0954755; -122.2724704 (Mare Island) | Solano | An island in San Pablo Bay near Vallejo. About 3.5 miles (5.6 km) long, site of a major shipyard. | |
| Mussel Rock | 37°40′01″N 122°29′50″W / 37.6668787°N 122.4971961°W / 37.6668787; -122.4971961 (Mussel Rock) | San Mateo | A stack in the Pacific Ocean near Daly City. About 200 feet (61 m) long. | |
| Rat Rock | 38°00′16″N 122°27′43″W / 38.00444°N 122.46194°W / 38.00444; -122.46194 (Rat Rock) | Marin | An 18-foot (5.5 m) tall rock north of China Camp. | |
| Red Rock Island | 37°55′45″N 122°25′51″W / 37.92917°N 122.43083°W / 37.92917; -122.43083 (Red Rock Island) | Contra Costa, Marin and San Francisco | This uninhabited 5.8-acre (2.3 ha) island is located in San Francisco Bay just south of the Richmond – San Rafael Bridge, near the meeting point of three counties. It is privately owned. | |
| San Pedro Rock | 37°35′43″N 122°31′27″W / 37.5952150°N 122.5241438°W / 37.5952150; -122.5241438 (San Pedro Rock) | San Mateo | A Pacific island near the city of Pacifica. About 800 feet (240 m) long. | |
| Seal Rocks (San Francisco, California) | 37°46′43″N 122°30′58″W / 37.77861°N 122.51611°W / 37.77861; -122.51611 (Seal Rock) | San Francisco | A series of large rocks in the Pacific Ocean that host a sea lion colony. | |
| Seal Rock (San Mateo County, California) | 37°23′30″N 122°25′29″W / 37.3916088°N 122.4246974°W / 37.3916088; -122.4246974 (Seal Rock) | San Mateo | A Pacific island south of Half Moon Bay, about 500 feet (150 m) long. | |
| Sears Rock | 37°49′43″N 122°32′57″W / 37.8285393°N 122.5491423°W / 37.8285393; -122.5491423 (Sears Rock) | Marin | A rock in the Centissima Reef. | |
| The Sisters | 37°59′18″N 122°26′28″W / 37.9882561°N 122.4410844°W / 37.9882561; -122.4410844 (The Sisters) | Marin | A pair of small islands in San Pablo Bay, 2,000 feet (610 m) south of Point Saint Pedro. | |
| Treasure Island | 37°49′29″N 122°22′16″W / 37.82472°N 122.37111°W / 37.82472; -122.37111 (Treasure Island) | San Francisco | This 403-acre (163 ha) artificial island in San Francisco Bay is tied to Yerba Buena Island. It was dredged out of the bay to house the Golden Gate International Exposition of 1939-40. | |
| West Marin Island | 37°57′57″N 122°28′22″W / 37.96583°N 122.47278°W / 37.96583; -122.47278 (West Marin Island) | Marin | Near San Rafael, California. | |
| Yerba Buena Island | 37°48′36″N 122°21′58″W / 37.81°N 122.36611°W / 37.81; -122.36611 (Yerba Buena Island) | San Francisco | This island in San Francisco Bay is home to a Coast Guard station. The San Francisco – Oakland Bay Bridge passes through it by means of a tunnel. |
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Read more about this topic: Islands Of San Francisco Bay
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