Second Reef

Second Reef is an advanced dive site in the offshore waters of the Ten Thousand Islands and Marco Island area — the middle tier of the layered reef system that characterizes Southwest Florida's Gulf floor, lying at greater depth than the inner First Reef and closer to the third and deepest reef zone offshore. This intermediate reef zone occupies deeper water than the First Reef designation and requires more advanced dive planning, with the depth and distance from shore putting it firmly in the advanced category. The Ten Thousand Islands offshore reef system is ecologically rich despite its distance from the more celebrated Florida Keys, and the Second Reef zone benefits from the open Gulf water quality that comes with greater offshore distance — cleaner, cleaner water and greater visibility than the turbid inshore zones, with the influence of Gulf of Mexico open-water productivity supporting excellent fish biomass at the structural features. Grouper species appropriate to the depth are the dominant apex predators: gag grouper, red grouper, and scamp grouper occupy the reef features with characteristic territorial authority. Large snapper species — red snapper, mangrove snapper, and at appropriate depths, vermilion snapper — fill the water column above and around the reef structure. The reefs in this zone see relatively low diver visitation compared to the heavily visited Keys reefs, giving the fish communities a freshness and relative human-inexperience that makes encounters more natural and intimate. Spotted eagle rays and the occasional shark cruise through on patrol. Access requires boat transport from Marco Island or Everglades City operators willing to make the offshore run to this productive but relatively remote section of the Southwest Florida Gulf floor.