Australia, it is the only continent that is also its own country.
Australia is a country (and also the only country that is also a continent.) Antartica, however, is not.
Australia is a self-contained country, so ... the largest country in Australia is Australia. It is also the largest country in the region of Australasia.
Australia is both a country and a continent
Australia is a country that is also considered a continent. It is the only country that occupies an entire continent.
Australia is the only populated country in Australia; therefore it is also the most highly populated country in Australia.
Australia is all ONE country. It doesn't have any smaller countries inside.
Australia is the name of their continent, and that is also the name of their country.
Australia is a continent that is also a country. Located in the southern hemisphere, it is the only continent that is also a single country.
Australia is the continent that is also a country. It is the only country to occupy an entire continent.
Australia is a continent and a country.
The only country that is also a continent is Australia.