The Kolombangara Upland Forest IBA comprises 30,963 ha of forested land covering the central caldera and the high ridges of Mounts Veve and Rano, with four corridors down through lowland forest to the coast. The birds include yellow-legged pigeons, crested cuckoo-doves, Mayr's swiftlets, Roviana rails, Heinroth's shearwaters, Sanford's sea eagles, Meek's lorikeets, black-faced pittas, North Melanesian cuckooshrikes, white-winged fantails, Kolombangara monarchs, Kolombangara leaf warblers and Kolombangara white-eyes. The Kolombangara Marine IBA covers some 80,000 ha of marine waters around the island, the site boundaries based on a seaward extension of 7 km from the coast, to encompass foraging and transit areas for the Heinroth's shearwaters that are believed to breed in the uplands of the island.
