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Oceania (sometimes Oceanica) is a geographical, often geopolitical, region consisting of numerous lands—mostly islands in the Pacific Ocean and vicinity. The term is often used in many languages to define one of the continents and is one of eight terrestrial ecozones.

Ethnologically, the islands of Oceania are divided into the subregions of Melanesia, Micronesia, and Polynesia.

Oceania sometimes is taken to include Australasia, which is made up of Australia, New Guinea, Papua New Guinea, New Zealand, and various islands of the Malay Archipelago.