Island |
Image |
Coordinates |
Description |
Anacapa Island |
|
34°00′16″N 119°23′58″W / 34.0044486°N 119.3995603°W / 34.0044486; -119.3995603 (Anacapa Island)[2] |
Located 14 miles (23 km) off the coast of Ventura, California. It contains 728 acres (295 ha) of land spread across three mountainous islets. The island has only three permanent residents. |
Begg Rock |
|
33°21′45″N 119°41′52″W / 33.3625°N 119.69778°W / 33.3625; -119.69778 (Begg Rock)[3] |
A 15-foot (4.6 m) high rock, located 8 miles (13 km) from San Nicolas Island. |
Prince Island |
|
34°03′29″N 120°20′01″W / 34.05806°N 120.33361°W / 34.05806; -120.33361 (Prince Island) |
Located near San Miguel Island and measures about 35 acres (14 ha). |
San Clemente Island |
|
32°54′00″N 118°30′03″W / 32.9000357°N 118.5009115°W / 32.9000357; -118.5009115 (San Clemente Island)[4] |
Southernmost Channel Island, containing 56.81 square miles (147.1 km2) of land. It is 24 miles (39 km) long, and uninhabited. An active U.S. Navy base is located on the island. |
San Miguel Island |
|
34°02′23″N 120°22′32″W / 34.0397186°N 120.3754264°W / 34.0397186; -120.3754264 (San Miguel Island)[5] |
Westernmost Channel Island, measuring 8 miles (13 km) long, 3.7 miles (6.0 km) wide, and containing 9,325 acres (3,774 ha) of land. The island is uninhabited, and is rarely visited. |
San Nicolas Island |
|
33°14′58″N 119°30′01″W / 33.2494750°N 119.5003847°W / 33.2494750; -119.5003847 (San Nicolas Island)[6] |
Is said to be the most remote island of the Channel Islands, and is used by the U.S. Navy as a weapons testing and training facility. It has no civilian inhabitants, but is inhabited by military personnel. It covers 14,562 acres (5,893 ha). |
Santa Barbara Island |
|
33°28′32″N 119°02′10″W / 33.4755796°N 119.0362111°W / 33.4755796; -119.0362111 (Santa Barbara Island)[7] |
Smallest Channel Island at 640 acres (260 ha) in area; it is located roughly between San Nicolas and Santa Catalina Islands. |
Santa Catalina Island |
|
33°23′00″N 118°25′03″W / 33.3833613°N 118.4175764°W / 33.3833613; -118.4175764 (Santa Catalina Island)[8] |
The most inhabited of the Channel Islands, with a population of 3,696 as of 2000. It is about 22 miles (35 km) long with a maximum width of 8 miles (13 km). It covers 74.98 square miles (194.2 km2). |
Santa Cruz Island |
|
34°02′25″N 119°50′37″W / 34.0402815°N 119.8437411°W / 34.0402815; -119.8437411 (Santa Cruz Island)[9] |
Santa Cruz Island measures 22 miles (35 km) long with an average width of 4 miles (6.4 km), covering 96.5 square miles (250 km2). It is the largest Channel Island. The island is now on public land, but was previously the largest privately owned island of the continental United States. |
Santa Rosa Island |
|
33°57′00″N 120°06′03″W / 33.9500030°N 120.1009639°W / 33.9500030; -120.1009639 (Santa Rosa Island)[10] |
Santa Rosa Island occupies 83.1 square miles (215 km2), and is the second largest Channel Island. The island has a permanent population of 2 persons, and is about 26 miles (42 km) off the coast of Santa Barbara, California. |
Shag Rock |
|
33°29′13″N 119°02′10″W / 33.4869680°N 119.0362112°W / 33.4869680; -119.0362112 (Shag Rock)[11] |
Small islet located off the north shore of Santa Barbara Island, and is only about 1 acre (0.40 ha). |
Sutil Island |
|
33°27′50″N 119°02′53″W / 33.4639132°N 119.0481557°W / 33.4639132; -119.0481557 (Sutil Island)[12] |
Located off the southwest shore of Santa Barbara Island, and is about 12 acres (4.9 ha). It is named for a Spanish ship exploring the West Coast in an expedition led by Sebastián Vizcaíno. |
Island |
Image |
Coordinates |
County |
Description |
Andrus Island |
|
38°09′28″N 121°35′54″W / 38.157695°N 121.598287°W / 38.157695; -121.598287 (Andrus Island) |
Sacramento |
3,000-hectare (7,400-acre) island, bounded by Sacramento River, Georgiana Slough, Mokelumne River, San Joaquin River, Jackson Slough, and Seven Mile Slough. |
Bacon Island |
|
37°58′36″N 121°33′08″W / 37.9765897°N 121.5521738°W / 37.9765897; -121.5521738 (Bacon Island) |
San Joaquin |
2,200-hectare (5,400-acre) island, bounded by Connection Slough, Old River, Woodward Island, and Middle River |
Bethel Island |
|
38°01′53″N 121°38′27″W / 38.0313099°N 121.6407865°W / 38.0313099; -121.6407865 (Bethel Island) |
Contra Costa |
1,450-hectare (3,600-acre) island, bounded by Taylor Slough, Piper Slough, Sand Mound Slough, and Dutch Slough |
Bouldin Island |
|
38°06′15″N 121°32′05″W / 38.1040858°N 121.5346747°W / 38.1040858; -121.5346747 (Bouldin Island) |
San Joaquin |
2,400-hectare (5,900-acre) island bounded by South Mokelumne River, Little Potato Slough, Potato Slough, and Mokelumne River. |
Bradford Island |
|
38°04′38″N 121°39′48″W / 38.0771417°N 121.6632872°W / 38.0771417; -121.6632872 (Bradford Island) |
Contra Costa |
885-hectare (2,190-acre) island in the lower delta bounded by the San Joaquin River, False River and the Bradford Island canal/slough. Accessible only by Ferry via Jersey Island, just south of it. |
Browns Island |
|
37°57′37″N 121°21′21″W / 37.9602015°N 121.3557810°W / 37.9602015; -121.3557810 (Browns Island) |
Contra Costa |
275-hectare (680-acre) island, bounded by Middle Slough, New York Slough, and Suisun Bay |
Jersey Island |
|
38°02′11″N 121°41′09″W / 38.0363096°N 121.685787°W / 38.0363096; -121.685787 (Jersey Island) |
Contra Costa |
1,425-hectare (3,520-acre) island, bounded by False River, Piper Slough, Taylor Slough, Dutch Slough and San Joaquin River. |
Jones Tract |
|
37°55′12″N 121°28′35″W / 37.919925°N 121.476338°W / 37.919925; -121.476338 (Upper Jones Tract)
37°57′16″N 121°29′38″W / 37.954368°N 121.493839°W / 37.954368; -121.493839 (Lower Jones Tract) |
San Joaquin |
4,900-hectare (12,000-acre) island (tracts, Upper- and Lower-), bounded by Empire Cut, Whiskey Slough, Trapper Slough, and Middle River, 10 km east of Stockton |
King Island |
|
38°03′56″N 121°26′12″W / 38.0654762°N 121.4366172°W / 38.0654762; -121.4366172 (King Island) |
San Joaquin |
1,300-hectare (3,200-acre) island bounded by White Slough, Bishop Cut, Disappointment Slough, and Honker Cut |
Kings Island |
|
37°51′29″N 121°34′08″W / 37.8579816°N 121.5688389°W / 37.8579816; -121.5688389 (Kings Island) |
Contra Costa |
3.5-hectare (8.6-acre) island in Old River |
McDonald Island |
|
38°00′05″N 121°29′24″W / 38.0013114°N 121.4899512°W / 38.0013114; -121.4899512 (McDonald Island) |
San Joaquin |
2,400-hectare (5,900-acre) island , bounded by San Joaquin River, Middle River, Latham Slough, and Empire Cut. |
Ryer Island |
|
38°14′26″N 121°38′03″W / 38.24047°N 121.6341217°W / 38.24047; -121.6341217 (Ryer Island) |
Solano |
4,750-hectare (11,700-acre), bounded by Miner Slough and Steamboat Slough. |
Sherman Island |
|
38°03′34″N 121°44′00″W / 38.0593642°N 121.7332878°W / 38.0593642; -121.7332878 (Sherman Island) |
Sacramento |
5,500-hectare (14,000-acre) island bounded by the Sacramento River, Three Mile Slough, and the San Joaquin River. |
Staten Island |
|
38°09′52″N 121°30′59″W / 38.1643617°N 121.5163415°W / 38.1643617; -121.5163415 (Staten Island) |
San Joaquin |
3,700-hectare (9,100-acre) island bounded and flanked by the North Mokelumne River and South Mokelumne River. |
Twitchell Island |
|
38°06′35″N 121°38′55″W / 38.1096407°N 121.6485651°W / 38.1096407; -121.6485651 (Twitchell Island) |
Sacramento |
3,000-hectare (7,400-acre), bounded by Seven Mile Slough, San Joaquin River, and Three Mile Slough |
Venice Island |
|
38°04′30″N 121°32′04″W / 38.07492°N 121.5343967°W / 38.07492; -121.5343967 (Venice Island) |
San Joaquin |
1,250-hectare (3,100-acre) island bounded by Potato Slough, Little Connection Slough, Stockton Deepwater Channel Venice Cut, and San Joaquin River. |
Victoria Island |
|
37°53′24″N 121°32′05″W / 37.8899253°N 121.5346722°W / 37.8899253; -121.5346722 (Victoria Island) |
San Joaquin |
2,900-hectare (7,200-acre) island bounded by North Victoria Canal, Middle River, Victoria Canal, and Old River. |
West Island |
|
38°01′24″N 121°46′43″W / 38.0232542°N 121.7785663°W / 38.0232542; -121.7785663 (West Island) |
Sacramento |
|
Winter Island |
|
38°02′32″N 121°50′55″W / 38.0421424°N 121.8485686°W / 38.0421424; -121.8485686 (Winter Island) |
Contra Costa |
Woodward Island |
|
37°55′42″N 121°32′46″W / 37.9282576°N 121.5460619°W / 37.9282576; -121.5460619 (Woodward Island) |
San Joaquin |
725-hectare (1,790-acre) island bounded by Bacon Island, Old River, Middle River, and Woodward Canal |
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)[19] |
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)[20] |
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)[21] |
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. |
Brother Islands |
|
37°57′48″N 122°25′59″W / 37.96333°N 122.43306°W / 37.96333; -122.43306 (Brother Islands) |
Contra Costa |
This pair of islands is located west off Point San Pablo in Richmond. 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. |