The atoll is comprised of four large coral islands which enclose a shallow lagoon; the group of islands is itself surrounded by a coral reef. Due to difficulties of access and the atoll’s isolation, Aldabra has been protected from human influence and thus retains some 152,000 giant tortoises, the world’s largest population of this reptile.
Criteria for inclusion as a World Heritage Site
|ix||To be outstanding examples representing significant on-going ecological and biological processes in the evolution and development of terrestrial, fresh water, coastal and marine ecosystems and communities of plants and animals.||All|
|vii||To contain superlative natural phenomena or areas of exceptional natural beauty and aesthetic importance.||All|
|x||To contain the most important and significant natural habitats for in-situ conservation of biological diversity, including those containing threatened species of outstanding universal value from the point of view of science or conservation.||All|
About the source: UNESCO
Within UNESCO's broad remit, this specialised agency of the UN works towards international cooperation agreements to secure the world's cultural and natural heritage, designating venues of exceptional value as World Heritage Sites.