Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems

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Lagoons of New Caledonia: A Coral Paradise of Exceptional Natural Beauty

The Lagoons of New Caledonia, inscribed as a UNESCO World Heritage Site in 2008, present a breathtaking underwater panorama that showcases the rich biodiversity and unique ecosystems found within this French Pacific Ocean archipelago. Comprising six marine clusters, these lagoons represent the primary diversity of coral reefs and associated ecosystems in New Caledonia, making it one of the three most extensive reef systems globally.

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UNESCO Description of the World Heritage Site

This serial site comprises six marine clusters that represent the main diversity of coral reefs and associated ecosystems in the French Pacific Ocean archipelago of New Caledonia and one of the three most extensive reef systems in the world. These Lagoons are of exceptional natural beauty. They feature an exceptional diversity of coral and fish species and a continuum of habitats from mangroves to seagrasses with the world’s most diverse concentration of reef structures. The Lagoons of New Caledonia display intact ecosystems, with healthy populations of large predators, and a great number and diversity of big fish. They provide habitat to a number of emblematic or threatened marine species such as turtles, whales or dugongs whose population here is the third largest in the world.

UNESCO Justification of the World Heritage Site

Criterion (vii): Superlative natural phenomena or natural beauty: The tropical lagoons and coral reefs of New Caledonia are considered to be some of the most beautiful reef systems in the world due to their wide variety of shapes and forms within a comparatively small area. This ranges from extensive double barrier systems, offshore reefs and coral islands, to the near-shore reticulate reef formations in the west coast zone. The richness and diversity of landscapes and coastal backdrops gives a distinctive aesthetic appeal of exceptional quality. This beauty continues below the surface with dramatic displays of coral diversity, massive coral structures, together with arches, caves and major fissures in the reefs.

Criterion (ix): Ongoing biological and ecological processes: The reef complex within this serial property is globally unique in that it is free-standing in the ocean and encircles the island of New Caledonia, providing a variety of different kinds of oceanographic exposure, including both warm and cold currents. The coral reef complex has a great diversity of forms including all the major reef types from fringing reefs to atolls, as well as associated ecosystems in both coastal and oceanic situations. Extending over important oceanic gradients, it is one of the planet's best examples of the ecological and biological processes underlying tropical lagoon and coral reef ecosystems, themselves one of the most ancient and complex ecosystem types.

Criterion (x): Biological diversity and threatened species: The property is a marine site of exceptional diversity with a continuum of habitats from mangroves to seagrasses and a wide range of reef forms. The barrier reefs and atolls in New Caledonia form one of the three most extensive reef systems in the world, and together with the reefs of Fiji, are the most significant coral reefs in Oceania. They are the location for the world’s most diverse concentration of reef structures, 146 types based on a global classification system, and they equal or even surpass the much larger Great Barrier Reef in coral and fish diversity. They provide habitat to a number of threatened fish, turtles, and marine mammals, including the third largest population of dugongs in the world.

Encyclopedia Record: New Caledonian barrier reef

The New Caledonian barrier reef is a barrier reef located in New Caledonia in the South Pacific, being the longest continuous barrier reef in the world and the third largest after the Great Barrier Reef of Australia and the Mesoamerican Barrier Reef.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment