... the Americas and Australasia. Australasia is a sub-group of Oceania. Oceania consists of Australia, New Zealand, Norfolk Island and three groups of island states: Melanesia, Polynesia and Micronesia. ... Micronesia. Taken together, Australia, New Zealand, Norfolk Island and the Melanesian islands are known as Australasia. is part of Oceania is combined with the Americas, whereas Polynesia and Micronesia ... completed by three additional a liate organizations: the International Finance Corporation (IFC), the Multilateral Investment Guarantee Agency (MIGA) and the International Centre for Settlement...