Pulu Keeling occupies the entire North Keeling Island, which is about 1.2 km2. The park includes the sea area of 1.5km from the coast as well. It is one of the most unaffected coral reefs in the world. The sea is protected due to extremely rare species of fish and turtles - there are some 528 species of fish, 610 species of molluscs and a total of 198 species of crustaceans. The Pulu Keeling is an important habitat of seabirds, the only terrestrial vertebrates present on the island. There are no mammals on the Pulu Keeling. Plants and trees on the island include a lot of original vegetation areas and endemic species.
Access to the island of Pulu Keeling is possible only on permit, with a park ranger. Starting points for visits to the Pulu Keeling are the West Island and Home Island.