The Coral Triangle is defined by marine zones containing at least 500 species of reef-building coral—the darkest area that is roughly triangular in shape shown in the map above.
Certain neighbouring countries, including Australia and Fiji, contain rich coral biodiversity as well, but with somewhat lower numbers.
The main criteria used by scientists and conservationists to delineate the Coral Triangle were:
- High species biodiversity (more than 500 coral species, high biodiversity of reef fishes, foraminifera, fungid corals, and stomatopods) and habitat diversity
- Oceanography (currents)5
The Coral Triangle
region is highlighted below in blue.