A diver is exploring a coral reef off of Key Largo. The reef systems in the Florida Keys National Marine Sanctuary off Key Largo in Florida is the only contiguous coral barrier reef in North America.
Key Largo may be best known for the John Pennekamp Coral Reef State Park, the first underwater park in the United States. Combined with the adjacent Florida Keys National Marine Sanctuary, the two parks comprise an area of 103 square nautical miles, featuring 55 varieties of coral and 500 species of fish. Their fragile living reefs are acclaimed as some of the most fascinating scuba diving sites in the world.