Aldabra Atoll

Aldabra Atoll is a remote coral atoll in the Outer Islands of the Seychelles, inscribed on the UNESCO World Heritage List in 1982 for its outstanding natural values. It is noted for its raised coral structure, extensive lagoon and exceptional concentrations of endemic and breeding species.

The atoll comprises a central lagoon, a surrounding coral rim and numerous low islets and beaches that host large seabird colonies and the world’s largest population of Aldabra giant tortoises. The reef and lagoon system support diverse marine life and complex intertidal habitats.

Aldabra’s ecosystems have remained relatively undisturbed by large-scale human settlement; conservation measures and restricted access aim to preserve its unique fauna and coral environments. Scientific research has been important for understanding atoll ecology and species populations.

Aldabra lies in the western Indian Ocean as part of the Seychelles Outer Islands; it is remote from the archipelago’s main population centres and is reached only by authorised expedition or research vessels operating under strict permit controls.

• Size and significance: Recognised as the world's largest raised coral atoll, covering an area of about 155 square kilometres and inscribed for its outstanding natural values.
• Wildlife and access: Holds the largest known population of Aldabra giant tortoises and extensive seabird colonies; visitor access is strictly controlled to protect wildlife.

What to See #

• Central lagoon: A large enclosed central lagoon surrounded by coral rim and low islands that forms the atoll's principal seascape and tidal flats.
• Fringing reef: Fringing reef structures and outer reef crest that protect the interior and host diverse coral and fish assemblages.
• Islets and beaches: Low coral islets and beaches that provide critical nesting habitat for seabirds and turtles and support the atoll's terrestrial communities.