The Coral Triangle is a geographical term so named as it refers to a roughly triangular area of the tropical marine waters of Indonesia, Malaysia, Papua New Guinea, Philippines, Solomon Islands and Timor-Leste that contain at least 500 species of reef-building corals in each ecoregion. This region encompasses portions of two biogeographic regions: the Indonesian-Philippines Region, and the Far Southwestern Pacific Region. The Coral Triangle is recognized as the global centre of marine biodiversity and a global priority for conservation. It is also called the "Amazon of the seas" and covers 5.7 million square kilometres (2,200,000 sq mi) of ocean waters. Its biological resources sustain the lives of over 120 million people. According to the Coral Triangle Knowledge Network, about $3 billion in fisheries exports and another $3 billion in coastal tourism revenues are derived as annual foreign exchange income in the region.
The WWF considers the region a top priority for marine conservation, and the organization is addressing the threats it faces through its Coral Triangle Program, launched in 2007.
While only covering 1.6% of the planet’s oceanic area, the region has 76% of all known coral species in the world. As a habitat for 52% of Indo-Pacific reef fishes and 37% of the world's reef fishes, it encompasses the highest diversity of coral reef fishes in the world More than 3,000 species of fish live in the Coral Triangle, including the largest fish - the whale shark, and the coelacanth. The Coral Triangle is the epicentre for the biodiversity of not only corals and fish, but many other marine organisms as well. It also provides habitat to six out of the world's seven marine turtle species.