 It includes the seas surrounding island groups of the western Pacific, including the Ryukyu Islands, Caroline Islands, Marianas Islands, New Guinea and the Bismarck Archipelago, Solomon Islands, Vanuatu, New Caledonia, Fiji, Tonga, and Lord Howe Island.It is bounded on the west by the Western Indo-Pacific, with the transition at the Strait of Malacca and in southern Sumatra.The Central Indo-Pacific includes the seas surrounding the northern half of Australia, while the Temperate Australasia marine realm includes the seas surrounding the southern half of Australia.