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to, more broadly, the entire insular region between Asia and the Americas, including Australasia and the Malay Archipelago.
or biogeographically as a synonym for either the Australasian ecozone (Wallacea and Australasia) or the Pacific ecozone (Melanesia, Polynesia, and Micronesia apart either from New Zealand or from mainland New Guinea).
UN geoscheme for Oceania