Australasia , an area including Australia, New Zealand, New Guinea and other islands including the eastern part of Indonesia
Oceania , a geographical (often geopolitical) region of many countries/territories (mostly islands) in the southern Pacific Ocean
strictly taken, that part of the Pacific Ocean area south of the equator bordered by Indonesia, New Guinea, Australia, New Zealand, the 60th south latitude, the west coast of South America and the equator. South of the 60° latitude, it is part of the Southern Ocean.