The Charleston Harbor is an inlet (8 sq mi/20.7 km²) of the Atlantic Ocean at Charleston, South Carolina. The inlet is formed by the junction of Ashley and Cooper rivers at . Morris and Sullivan's Islands shelter the entrance. Charleston Harbor is part of the Intracoastal Waterway.
Charleston Harbor was the site of the first successful submarine attack in history on February 17, 1864, when the H.L. Hunley made a daring night attack on the USS Housatonic, during the American Civil War.
- Charleston, South Carolina in the American Civil War
- Waterways forming and crossings of the Atlantic Intracoastal Waterway
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