Andros Barrier Reef

The Andros Barrier Reef is one of the largest barrier reef systems on earth, stretching over 190 kilometres along the eastern coastline of Andros Island and the dramatic oceanic trench called the Tongue of the Ocean, making it comparable in scale to the better-known reef systems of Belize and Australia.

What makes the Andros reef distinctive is its relationship to the Tongue of the Ocean, a deep oceanic trench that drops to over 1,800 metres just beyond the reef crest, creating a dramatic wall dive environment where the reef drops vertically from shallow coral heads into the abyss in a matter of metres from the surface.

The reef is considered exceptionally healthy and relatively untouched by the mass tourism that has damaged other Caribbean reef systems, with extensive coral cover including brain coral, staghorn and elkhorn coral, sea fans and a remarkable density of marine life including eagle rays, nurse sharks, sea turtles and hundreds of species of tropical fish.

The Tongue of the Ocean is also renowned for its blue water diving; the water column between the reef crest and the deep trench is remarkably clear and full of pelagic species including sailfish, wahoo and marlin that move through these waters seasonally, making Andros a destination for serious anglers as well as divers.

Andros itself is the largest island in the Bahamas, largely undeveloped and covered in pine forests, freshwater bights and the famous blue holes of the interior, making the barrier reef the coastal complement to a wilderness that is still being explored and documented by marine scientists.

Access to the Andros Barrier Reef is primarily from small boats departing from the small settlements on Andros's eastern coast, and the lack of large-scale resort infrastructure means that diving here is an expedition rather than a resort activity, suited to experienced divers who can handle boat trips to remote sites.

Andros is also famous for its blue holes, the inland freshwater sinks that dot the island's interior, adding a terrestrial geological dimension to the marine reef environment and making the island a destination for cave divers and geologists as well as open-water reef specialists.

The reef system has been the subject of ongoing scientific study by the Perry Institute for Marine Science, which has documented coral spawning events, reef recovery following bleaching events and the population dynamics of the Nassau grouper, making Andros one of the most scientifically important reef environments in the entire Caribbean region.

The third largest barrier reef in the world, with exceptional coral cover and marine biodiversity.

The proximity of the reef to the deep Tongue of the Ocean trench creates world-class wall diving conditions.

The reef remains relatively pristine due to limited resort development, unlike heavily bleached Caribbean reef sites.