Oceania (orthographic projection).svg
Map of Oceania
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Oceania (UK /ˌʃɪˈɑːniə, ˌsɪ-/[1] or US /ˌʃˈæniə/),[2] also known asOceanica,[3] is a region centred on the islands of the tropical Pacific Ocean.[4] Opinions of what constitutes Oceania range from its three subregions of MelanesiaMicronesia, andPolynesia[5] to, more broadly, the entire insular region between Asia and the Americas, including Australasia and the Malay Archipelago.[6] The term is often used more specifically to denote a continent comprising Australia and proximate islands,[7][8][9][10] or biogeographically as a synonym for either the Australasian ecozone (Wallacea andAustralasia) or the Pacific ecozone (Melanesia, Polynesia, and Micronesia apart either from New Zealand[11] or from mainland New Guinea).[12]