The Seychelles, a 115-island archipelago scattered across 1.4 million square kilometers of the western Indian Ocean, combine some of the world's most dramatic granite landscapes above water with a rich underwater realm shaped by the meeting of African and Asian marine biogeography. Unlike the rest of the Indian Ocean, many of these islands sit on the Mascarene Plateau — a submerged microcontinent — giving the inner islands their unique granite boulders both above and below the surface.
The Inner Islands around Mahé, Praslin, and La Digue offer easy diving among massive granite formations covered in soft corals, gorgonians, and feather stars. Sites like Shark Bank, Brissare Rocks, and L'îlot are home to whitetip reef sharks, eagle rays, schooling batfish, and dense coral fish populations. Whale sharks visit between August and November during the southeast monsoon.
The Outer Islands — including Aldabra, Astove, Cosmoledo, and Alphonse — are reachable only by extended liveaboard expeditions and represent some of the most pristine atolls left on the planet. Aldabra, the world's second-largest coral atoll and a UNESCO World Heritage Site, hosts more than 100,000 giant tortoises and reef systems that see fewer than 500 divers per year. Tiger sharks, manta rays, and dense pelagic action are the rule, not the exception.
Cosmoledo has been called the "Galapagos of the Indian Ocean" for the sheer density of large marine life. Schooling hammerheads, large groupers, dogtooth tuna, and aggregating bumphead parrotfish gather in numbers that recall historic accounts of Pacific reefs. Strong currents demand experienced divers, but the rewards are unmatched in the region.
Desroches Island and Alphonse provide world-class wall diving with pristine hard coral cover and outstanding visibility frequently above 35 meters. Drift dives along the Desroches Drop offer reef sharks, eagle rays, and Napoleon wrasse, while shallow lagoons shelter green and hawksbill turtle nesting beaches.
Above water, the Seychelles offer some of the most photographed beaches in the world — Anse Source d'Argent and Anse Lazio routinely top global rankings. Combined with stable water temperatures of 26–29°C, two distinct diving seasons, and strict marine park protection across nearly 30 percent of the country's waters, the Seychelles deliver a true blend of luxury and wilderness diving.
