Aldabra Atoll

Victoria · Aldabra Group · Seychelles

Aldabra Atoll is one of the largest raised coral atolls on Earth, measuring 34 kilometres long and 14.5 kilometres wide, lying over 1,100 kilometres southwest of Mahe in the most remote reaches of the Seychelles archipelago. Designated a UNESCO World Heritage Site in 1982, Aldabra is surrounded by near-pristine coral reefs and marine habitats that support a staggering diversity and abundance of life, largely untouched by human activity. The diving around Aldabra is defined by its walls and channels. The outer reef drops from shallow coral gardens into walls that plunge hundreds of metres into the Indian Ocean, offering some of the most dramatic vertical scenery available to divers anywhere in the world. Tidal channels connecting the lagoon to the open ocean create powerful currents that concentrate marine life, attracting manta rays to cleaning stations, tiger sharks to patrol routes, and dense aggregations of grey reef sharks along the wall edges. Giant morays, Napoleon wrasses, enormous groupers, and clouds of jacks and barracuda complete a cast of characters that defies normal expectations. What distinguishes Aldabra from every other dive destination is its isolation. Fewer than a thousand divers visit each year, and the marine life reflects this lack of human pressure. Fish show no wariness of divers, sharks approach closely, and turtles, both green and hawksbill, are so abundant they seem to occupy every section of the reef. Above water, Aldabra is home to the world's largest population of giant tortoises, and humpback whales pass through the surrounding waters during their annual migration. Reaching Aldabra requires a dedicated expedition, typically a 10-14 day liveaboard voyage from Mahe that includes diving at other remote outer islands like Astove and Cosmoledo. Strong currents and exposed conditions mean solid diving experience is necessary, and prior permission from the Seychelles Islands Foundation is mandatory. For those willing to invest the time and effort, Aldabra delivers what may be the closest thing to diving a reef as nature intended it, before the modern world arrived.