San Clemente Island, Naval island in Los Angeles County, United States.
San Clemente Island is an island in Los Angeles County, California, stretching roughly 21 miles (34 kilometers) across the Pacific Ocean. The northeastern side rises sharply from the water, while the southwestern coast descends in stepped formations toward the sea.
The U.S. Navy took control of the territory in 1934 and established training facilities for naval operations. During World War II, the area became a firing range and expanded into a full training base.
Archaeological evidence indicates human settlements dating back 10,000 years, with the Tongva people maintaining connections through trade with mainland communities.
Access remains heavily restricted due to ongoing military activities and requires formal Navy authorization. Visitors should keep in mind that training exercises can occur at any time and movement is limited.
Archaeological finds show that people settled here as far back as ten thousand years and maintained connections with the mainland. Today, protected animal species such as the San Clemente Island fox and a rare shrike live across the different climate zones.
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