Neither. It is the capital city of the nation of Australia, which also happens to be a continent.
Both, Australia is an island continent and a country. If you are a resident of Canberra, you are a resident of both an island and a continent.In this scenario, you are a resident of a continent, also...
continent
Greece is a country on the European Continent, and the continent closest to it is Asia
Er... it depends I think. But probably Antarctica because it is cold or Africa because its hot? Duh