Thislist of islands ofCalifornia is organized into sections, generally arranged from north to south. The islands within each section are listed in alphabetical order.
TheGeographic Names Information System (GNIS) lists 527 named islands in the state.[1]
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Sugar Loaf Island |  | 40°26′20″N124°24′50″W / 40.438767°N 124.413783°W /40.438767; -124.413783 (Sugar Loaf Island) | Sugar Loaf Island, offshoreCape Mendocino, rises 128 feet (39 m) above mean sea level. It is a special zone in theSouth Cape Mendocino State Marine Reserve and is closed to public access.[2][3] Being offshore of Cape Mendocino, the westernmost point in California, Sugar Loaf Island is called the westernmost island in the state.[4] |
All three islands inHumboldt Bay are located in the narrow midsection of the bay. This portion of the bay is located within the City ofEureka, California entirely withinHumboldt County.
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Daby Island |  | 40°48′41″N124°09′07″W / 40.8114°N 124.151837°W /40.8114; -124.151837 (Daby Island) | The smallest of the three islands within Humboldt Bay, Daby Island has a maximum elevation of 3 feet (0.91 m) and is located slightly northeast of Woodley Island. |
| Tuluwat Island |  | 40°48′46″N124°10′06″W / 40.8129°N 124.1684°W /40.8129; -124.1684 (Tuluwat Island) | The largest island, 1.3 miles (2.1 km) long, was originally the center of culture and population of the indigenousWiyot people. Now protected, no public access is allowed, except for the Wiyot and grandfathered residents. |
| Woodley Island | | 40°48′34″N124°09′38″W / 40.809516°N 124.160549°W /40.809516; -124.160549 (Woodley Island) | The second largest of the three islands within Humboldt Bay contains: the Woodley Island Marina (Eureka's largest marina), the Eureka regional office of theNational Weather Service, and offices of theHumboldt Bay Harbor Recreation & Conservation District. |
Map: Islands of theSan Francisco Bay Area | |
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TheFarallon Islands are a group of rugged small islands over 20 miles (32 km) offshore from the mainland of the City and County ofSan Francisco, which they are also formally within. They consist of over twenty small islets divided into north, south and middle sections, as well as a majorbank, Fanny Shoal. The surrounding waters were once used as a disposal site forradioactive waste.[9]
Suisun Bay is an arm of the San Francisco Bay estuary which connects theSacramento andSan Joaquin Rivers to theCarquinez Strait.
Map: Islands ofSuisun Bay and theSacramento–San Joaquin River Delta | |
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TheSacramento–San Joaquin River Delta is aninverted delta at the juncture of the Sacramento and San Joaquin rivers. There are about 57 named islands in the Delta.
TheChannel Islands are a group of eight main islands and several minor islands in thePacific Ocean off the coast ofSanta Barbara,Los Angeles, andVentura counties inSouthern California. The four northern islands are protected inChannel Islands National Park, while two are used by theU.S. Navy.
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Anacapa Island |  | 34°00′16″N119°23′59″W / 34.0045°N 119.3996°W /34.0045; -119.3996 (Anacapa Island)[11] | Located 14 miles (23 km) off the coast ofVentura, California. It contains 728 acres (295 ha) of land spread across three mountainous islets. The island has only three permanent residents. Part of the Greater Los Angeles Area. |
| Begg Rock | 33°21′45″N119°41′52″W / 33.36250°N 119.69778°W /33.36250; -119.69778 (Begg Rock)[12] | A 15-foot (4.6 m) high rock, located 8 miles (13 km) from San Nicolas Island. | |
| Prince Island | 34°03′29″N120°20′01″W / 34.05806°N 120.33361°W /34.05806; -120.33361 (Prince Island) | Located nearSan Miguel Island and measures about 35 acres (14 ha). | |
| San Clemente Island |  | 32°54′00″N118°30′03″W / 32.9000°N 118.5009°W /32.9000; -118.5009 (San Clemente Island)[13] | Southernmost Channel Island, containing 56.81 square miles (147.1 km2) of land. It is 24 miles (39 km) long. An activeU.S. Navy base is located on the island. In Los Angeles County. |
| San Juan Island |  | 32°28′41″N119°12′54″W / 32.478°N 119.215°W /32.478; -119.215 (San Juan Island)[14] | Historical San Juan Island, modern Cortes Bank, is a high seamount, an island submerged 6 feet and more, 96 mi SW ofSan Pedro, 111 mi (166 km) W ofPt Loma, and 47 mi (82 km) SW ofSan Clemente Island. The outermost feature in the Channel Islands, it has been visible as an island from elevations on San Clemente Island on clear days, and known for some of the world’s largest surf. Offshore from Orange County. |
| San Miguel Island |  | 34°02′23″N120°22′31″W / 34.0397°N 120.3754°W /34.0397; -120.3754 (San Miguel Island)[15] | 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. Part of the Greater Los Angeles Area. |
| San Nicolas Island | 33°14′58″N119°30′01″W / 33.2495°N 119.5004°W /33.2495; -119.5004 (San Nicolas Island)[16] | Is said to be the most remote island of the Channel Islands, and is used by theU.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). Part of the Greater Los Angeles Area. | |
| Santa Barbara Island |  | 33°28′32″N119°02′10″W / 33.4756°N 119.0362°W /33.4756; -119.0362 (Santa Barbara Island)[17] | Smallest Channel Island at 640 acres (260 ha) in area; it is located roughly between San Nicolas andSanta Catalina Islands. Part of the Greater Los Angeles Area. |
| Santa Catalina Island |  | 33°23′00″N118°25′03″W / 33.3834°N 118.4176°W /33.3834; -118.4176 (Santa Catalina Island)[18] | The most populous of the Channel Islands, with 3,696 residents 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). In Los Angeles County. |
| Santa Cruz Island |  | 34°02′25″N119°50′37″W / 34.0403°N 119.8437°W /34.0403; -119.8437 (Santa Cruz Island)[19] | 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. Part of the Greater Los Angeles Area. |
| Santa Rosa Island |  | 33°57′00″N120°06′04″W / 33.9500°N 120.1010°W /33.9500; -120.1010 (Santa Rosa Island)[20] | 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 ofSanta Barbara, California. Part of the Greater Los Angeles area. |
| Shag Rock | 33°29′13″N119°02′10″W / 33.4870°N 119.0362°W /33.4870; -119.0362 (Shag Rock)[21] | 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″N119°02′54″W / 33.4639°N 119.0482°W /33.4639; -119.0482 (Sutil Island)[22] | Located off the southwest shore of Santa Barbara Island, and is about 12 acres (4.9 ha). It is named for aSpanish ship exploring the West Coast in an expedition led bySebastián Vizcaíno. |
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Island Chaffee | 33°44′23″N118°08′20″W / 33.7397°N 118.1390°W /33.7397; -118.1390 (Island Chaffee) | Anartificial island/oil platform named after astronautRoger B. Chaffee who died in theApollo 1 accident. Located inSan Pedro Bay. | |
| Deadman's Island |  | 33°43′25″N118°15′57″W / 33.7236°N 118.2659°W /33.7236; -118.2659 (Terminal Island) | An island with a landmark mound at the mouth ofLos Angeles Harbor, flattened in 1928 for aFederal Prison and Coast Guard Base. Joined by a short causeway to Terminal Island, the newer island is sometimes referred to as Isla del Umberto or more often, Reservation Point. The former mound with a natural arch was called “Deadman’s Island” for the graves at top. |
| Freeman Island | 33°44′29″N118°09′45″W / 33.7414°N 118.1624°W /33.7414; -118.1624 (Freeman Island) | Anartificial island/oil platform named after astronautTheodore Freeman who died in a crash. Located inSan Pedro Bay. | |
| Island Grissom | 33°45′33″N118°10′53″W / 33.7592°N 118.1815°W /33.7592; -118.1815 (Island Grissom) | Anartificial island/oil platform named after astronautGus Grissom who died in theApollo 1 accident. Located inSan Pedro Bay. | |
| Naples Islands | 33°27′05″N118°43′12″W / 33.4515°N 118.7201°W /33.4515; -118.7201 (Naples Islands) | A neighborhood inLong Beach that consists of three different islands divided by canals which empty out intoAlamitos Bay. | |
| Terminal Island |  | 33°45′25″N118°14′53″W / 33.7570°N 118.2481°W /33.7570; -118.2481 (Terminal Island) | An expansion of natural Rattlesnake Island, which stretched betweenSan Pedro andLong Beach. Earth dredged from shallow San Pedro Bay was used as landfill. It is 3.5 miles (5.6 km) long and covers an area of 4.46 square miles (11.6 km2). The picture shows Reservation Point, formed after Deadman’s Island was leveled. |
| Island White | 33°45′10″N118°09′33″W / 33.7528°N 118.1592°W /33.7528; -118.1592 (Island White) | Anartificial island/oil platform named after astronautEd White who died in theApollo 1 accident; Located inSan Pedro Bay.[23][24] |
The bay associated withNewport Harbor and the city ofNewport Beach, California.
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Balboa Island |  | 33°36′23″N117°53′40″W / 33.60639°N 117.89444°W /33.60639; -117.89444 (Balboa Island) | A 50-hectare (120-acre), densely populated harbor island with 1,500 expensive homes. Partially created as a result of theSanta Ana River flooding in 1824, then artificially expanded to its present size. |
| Bay Island |  | 33°36′25″N117°54′18″W / 33.607°N 117.905°W /33.607; -117.905 (Bay Island) | West of Balboa Island. |
| Collins Island | 33°36′31″N 117°54′1″W | A small island located at the end ofBalboa Island | |
| Harbor Island |  | 33°36′01″N117°54′10″W / 33.6003°N 117.9028°W /33.6003; -117.9028 (Harbor Island) | |
| Lido Isle |  | 33°36′14″N117°55′02″W / 33.6039°N 117.9173°W /33.6039; -117.9173 (Lido Isle) | Northwest of Balboa Island. |
| Linda Isle |  | 33°36′50″N117°54′13″W / 33.6139°N 117.9037°W /33.6139; -117.9037 (Linda Isle) | |
| Newport Island | Located at the far west end of the bay |
| Island | Image | Coordinates | Description |
|---|---|---|---|
| Rincon Island |  | 34°20′51″N119°26′43″W / 34.3475°N 119.4454°W /34.3475; -119.4454 (Rincon Island) | A 1 acre (0.40 ha) artificial island off the coast ofVentura County, leased for oil and gas production. |
| San Mateo Rocks | 33°24′17″N117°37′02″W / 33.4048°N 117.6173°W /33.4048; -117.6173 (San Mateo Rocks) | Sea lion haul-out and scuba destination nearSan Clemente inOrange County | |
| Smith Island | 35°09′45″N120°45′14″W / 35.1626°N 120.754°W /35.1626; -120.754 (Smith Island) | Rocky island in San Luis Bay,Avila Beach, California |
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