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San Clemente Island facts for kids

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San Clemente Island
Native name:
Kinkipar (Tongva)
Isla de San Clemente (Spanish)
San Clemente Island by Sentinel-2, 2019-03-30.jpg
Location Pacific Ocean
Coordinates 32°54′N 118°30′W / 32.900°N 118.500°W / 32.900; -118.500
Archipelago Channel Islands (California)
State  California
County Los Angeles
Californian Channel Islands map en
Map of Channel Islands

San Clemente Island (Tongva: Kinkipar; Spanish: Isla de San Clemente) is the southernmost of the Channel Islands of California. It is owned and operated by the United States Navy, and is a part of Los Angeles County. It is administered by Naval Base Coronado. It is 21 miles (34 km) long and has 147.13 km2 (56.81 sq mi) of land. The census estimates 148 military and civilian personnel resident on the island in 2018. The city of San Clemente in Orange County, California is named after the island.



This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, San Clemente Island has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.

Climate data for San Clemente Island, CA
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °F (°C) 65
Average low °F (°C) 49
Source: < >


Fauna and flora

The San Clemente Island loggerhead shrike is an endangered species that the Navy is taking steps to protect. The San Clemente Island fox is an indigenous species. Feral goats roamed the island for centuries, reaching a population of 11,000 in 1972, when their effect on indigenous species was realized. By 1980 the population had been reduced to 4,000. A plan for shooting remaining goats was blocked in court by the Fund for Animals, so the goats were removed with nets and helicopters. The San Clemente Island goat is a recognized breed of domestic goat. The coves around the island are visited by snorkelers attracted by the abundant sea life, including sea lions, spiny lobsters, hydrocoral and kelp forests. The Island is also home to the endangered San Clemente Island Sage Sparrow

The flora of the island includes some plant species found nowhere else in the world. These endemic species include the wildflowers San Clemente Island brodiaea, San Clemente Island triteleia, San Clemente Island woodland star, and San Clemente Island Indian paintbrush, and the shrubs San Clemente Island bushmallow and Blair's wirelettuce. A unique subspecies of toyon, ssp. macrocarpa, also grows here, as do two rare subspecies of the royal larkspur.

Earthworms appear to have been introduced in 2008 in soil from the mainland used in a road construction project. In this earthworm-free region, the worms alter the soil and microbial communities which allows nonnative plants to alter the island’s unique ecosystem and threaten biodiversity that exists there.


Archaeologists have found traces of human occupation on San Clemente Island dating back 10,000 years.

Later inhabitants left trade materials from the northern islands and from the mainland, including Coso obsidian from the California desert. It has not been established what tribe the recent inhabitants belonged to, although the Tongva, who are well attested from Santa Catalina Island, are the most likely candidates. The Chumash, who occupied the northern Channel Islands, may have influenced the inhabitants. Evidence of battles; 'the skeletons of dozens of men piled, one upon another' were also noted on San Clemente and San Nicolas.

The first European to sight the island was Juan Rodríguez Cabrillo in 1542, who named it Victoria. It was renamed by Spanish explorer Sebastián Vizcaíno, who spotted it on November 23, 1602, Saint Clement's feast day. It was used by ranchers, fishermen, and smugglers during the 19th century and into the 20th century.

In 1835, the whaleship Elbe of Poughkeepsie, New York, under Captain Josiah B. Whippey (or Whipple), hunted sperm whales as far north as "St. Clements Island" (San Clemente Island). The American steamship Lansing, as well as the steam-schooner California, both anchored in Pyramid Cove, on the south side of San Clemente Island, to process blue, fin and humpback whales caught by their "killer boats" (steam-driven whale catchers)—the former between 1926 and 1930, and the latter between 1933 and 1937. In 1935, the Norwegian factory ship Esperanza caught blue whales as far north as San Clemente Island.

View from space of Southern California coast, showing Santa Catalina Island (closer to mainland) and San Clemente Island (farther from mainland).

Navy base

The US Navy acquired the island in 1934. It is the Navy's only remaining ship-to-shore live firing range, and is the center of the integrated air/land/sea San Clemente Island Range Complex covering 2,620 nm2 (8,990 km2).

During World War II, the island was used as a training ground for amphibious landing craft. These small to mid-sized ships were crucial to the island hopping that would be required to attack the islands occupied by the Japanese.

It is an active sonar base and has a $21 million simulated embassy for commando training.

There is a US Navy rocket-test facility on San Clemente. Some Polaris-program test rockets were launched from San Clemente between 1957 and 1960. The SEALAB III project took place off San Clemente in February 1969.

The US Navy uses the island as an auxiliary naval airfield, Naval Auxiliary Landing Field San Clemente Island. The main runway 23/05 is used for carrier training by the Navy. Other branches also use this airfield, including the United States Coast Guard. Pilots that use this airfield find it to be one of the most demanding airbases in the US, known for its high winds and dangerous terrain surrounding the runway.

The airfield is home to the United States Navy SEALs training facilities located north of the runways.


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See also

Kids robot.svg In Spanish: Isla San Clemente para niños

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