There is Hunting Island, Fripp Island, Hilton Head Island, Daufuskie Island, Kiawah Island, Seabrook Island, and Edisto Island. Some of the artificial reefs are Jim Caudle Reef, Little River Offshore Reef, Barracuda Alley, and Will Goldfinch Reef. The South Carolina Department of Natural Resources has a wonderful pdf.
over 2,900 individual reefs and 900 islands
they are islands of coral
The Bahamas, The Cayman Islands and The Turks and Caicos Islands,Tobago,Barbadoes
Most Caribbean islands are without coral reefs. Coral reefs are present in the Pacific Ocean. There is nothing to suggest that Dominica is an exception.
The Great Barrier Reef is composed of roughly 3000 individual reefs and 900 islands.