Geomorphologists believe that the island of New Guinea, of which Papua is a part, may once have been part of the Australian continent. The breakup and tectonic action created towering, snowcapped mountain peaks lining the island's central east-west spine and hot, humid alluvial plains along the coasts. The New Guinea Highlands range some 650 kilometres (404 mi) east to west along the island, forming a mountainous spine between the north and south coasts. A number of islands off the coast of New Guinea have their own distinctive habitats, including the limestone islands of Biak, in the entrance to the large Cenderawasih Bay at the northwest end of the island.
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