Oceania

geographical name

Oce·​a·​nia ˌō-shē-ˈa-nē-ə 

-ˈā-

the lands of the central and southern Pacific Ocean including Micronesia, Melanesia, and Polynesia (including New Zealand)

Note: Some people also consider Australia and the Malay Archipelago to be part of Oceania.

Oceanian

ˌō-shē-ˈa-nē-ən 

-ˈā-

adjective or noun