those in Southeast Asia and the Malay Archipelago) are considered to be geographically at the centre of the political Indo-Pacific. Subdivisions The WWF and Nature Conservancy divide the Indo-Pacific into 3 realms (or subrealms), and each of these into 25 marine provinces and 77 ecoregions (Marine Ecoregions of the World; MEOW) based on data-driven expert opinion. Other schemes for subdivision of the Indo-Pacific have included: 5 provinces, based on endemism in fishes; 3 regions split into 10 provinces based on dissimilarity of fish assemblages, 11 provinces based on range boundaries in corals, 12 divisions split into 124 ecoregions based on biogeographic clustering from coral distributions and finally 8 realms from distributions of 65,000 marine species. All but the last of these schemes were tested against one another by an international consortium of marine scientists using genetic data from 56 Indo-Pacific species, with the reasoning that genetic data should reflect the evolutionary processes that structure the Indo-Pacific. While there was no clear winning scheme, and all schemes were supported by data from at least one species, the genetic data in general favored schemes with few subdivisions, supporting the Indo-Pacific as relatively unstructured biogeographic realm - possibly the world's largest. Below are briefly described the 3 MEOW realms of the Indo-Pacific: Central Indo-Pacific The Central Indo-Pacific includes the numerous seas and straits connecting the Indian and Pacific oceans, including the seas surrounding the Indonesian archipelago (with the exception of Sumatra's northwest coast, which is part of the Western Indo-Pacific), the South China Sea, the Philippine Sea, the north coast of Australia, and the seas surrounding New Guinea, western and central Micronesia, New Caledonia, the Solomon Islands, Vanuatu, Fiji, and Tonga. The Central Indo-Pacific, due in part to its central location at the meeting of two oceans, has the greatest richness and diversity of marine organisms, specifically located within the Coral Triangle, which contains 76% of all known coral species in the world. Eastern Indo-Pacific The Eastern Indo-Pacific surrounds the mostly volcanic islands of the central Pacific Ocean, extending from the Marshall Islands in the west through central and southeastern Polynesia to Hawaii, to the west coast of Chile. The World Wide Fund for Nature believe the region ends at Chile's Easter Island and Isla Salas y Gómez, although it is sometimes extended even further to include Chile's Desventuradas Islands and Juan Fernández Islands. Western Indo-Pacific The Western Indo-Pacific covers the western and