First Reef

First Reef is an intermediate dive site in the waters of the Ten Thousand Islands and Marco Island area of Southwest Florida — a natural reef structure at depths reaching approximately 23 meters (about 75 feet) that represents the first of a series of reef zones running parallel to the coast in this ecologically rich section of the Gulf of Mexico. The layered reef system of Southwest Florida — with inner, middle, and outer reef zones at progressively greater depths — mirrors in simplified form the multi-zone reef structure of the Florida Keys, and the First Reef designation identifies the innermost and shallowest of these zones accessible to intermediate divers. The reef structure features the limestone ledge and rock formations that characterize Southwest Florida's Gulf reef system, with undercut ledge faces providing shelter for large concentrations of snapper and grouper. The Ten Thousand Islands' ecological richness is reflected in the fish diversity at First Reef: gag grouper, one of the Gulf's most characteristic recreational fish species, occupy prime ledge positions with the relaxed territorial authority of animals well suited to their environment. Red snapper and mangrove snapper fill the mid-water above the reef in numbers that speak to the health and productivity of this relatively lightly fished section of the Gulf. Amberjack make periodic visits to the site in purposeful circling passes. Spotted eagle rays cruise the sandy areas beside the ledge. The intermediate difficulty reflects the depth and the current patterns that can develop along this section of the Gulf Coast on windy days, requiring active management of position and air consumption. First Reef is best dived in calm morning conditions from a stable boat with experienced local guides from Marco Island or the surrounding area.