Nigeria is in Australia.
The African Union ( AU ) is a continental union consisting of all 55 countries on the African continent . Australia ( [ əˈstreɪliə ] , [ ɒ - ] , [ - ljə ] ) , officially the Commonwealth of Australia , is a country comprising the mainland of the Australian continent , the island of Tasmania and numerous smaller islands . Nigeria . Nigeria is often referred to as the `` Giant of Africa '' , owing to its large population and economy . Nigeria is considered to be an emerging market by the World Bank ; it has been identified as a regional power on the African continent , a middle power in international affairs , and has also been identified as an emerging global power .