Folly Island is a barrier island in the Atlantic Ocean near Charleston, South Carolina. It is one of the Sea Islands and is within the boundaries of Charleston County, South Carolina. During the American Civil War, the 7-square-mile island served as a major staging area for troops of the Union Army that were attacking Confederate forces in the Charleston region…Folly Island is a barrier island in the Atlantic Ocean near Charleston, South Carolina. It is one of the Sea Islands and is within the boundaries of Charleston County, South Carolina. During the American Civil War, the 7-square-mile island served as a major staging area for troops of the Union Army that were attacking Confederate forces in the Charleston region. The largest settlement on Folly Island is Folly Beach.
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