<Li> Christchurch, New Zealand </Li> <Li> Port Moresby, Papua New Guinea </Li> <Li> Jayapura, Indonesia </Li> <P> Oceania (UK: / ˌoʊʃiˈɑːniə, ˌoʊsi - / or US: / ˌoʊʃiːˈæniə /) is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia . Spanning the eastern and western hemispheres, Oceania covers an area of 8,525,989 square kilometres (3,291,903 sq mi) and has a population of 40 million . Situated in the southeast of the Asia Pacific region, Oceania is the smallest continental grouping in land area and the second smallest in population after Antarctica . </P>

When did the continent of australia become oceania