The following outline is provided as an overview and topical guide to Oceania. Oceania is a geographical, and geopolitical, region consisting of numerous lands—mostly islands in the Pacific Ocean and vicinity. The term is also sometimes used to denote a continent comprising Australia and proximate Pacific islands. The boundaries of Oceania are defined in a number of ways. Most definitions include parts of Australasia such as Australia, New Zealand, and New Guinea, and parts of Maritime Southeast Asia. Ethnologically, the islands of Oceania are divided into the subregions of Melanesia, Micronesia, and Polynesia. (en)