Australia is the largest country of the continent of Oceania, covering up most of the continent's parameters, and arguably considered as the world's sixth-largest country by total area. It's capital city is Canberra, and it's largest and populous city is Sydney. Bordered by neighouring countries, including the Papua New Guinea, Indonesia, and East Timor to the north, the Solomon Islands and Vanuatu to the north-east, and New Zealand to the south-east, Australia was inhabited by natives, known as Aboriginals, before the first British settlement in the late 18th century. After a series events, revolving around the Great Britain's colonization on the country, Australia has eventually stabled liberal democratic political system that functions as a federal parliamentary constitutional monarchy, comprising six states and ten territories. Australia is also a highly developed country, being the world's 13th-largest country in economy zone.
Regarding the villain tournaments context, Australia does not appear in the majority of the series, mentioned only as the nationality of heroes and villains respectively, including Jake, Cody, the Marahute, and Percival C. McLeach, and the Saltwater Crocodiles. Still, it's existence is displayed by the appearance of Hexxus' tree, in Ferngully, whom many villains sought after it for their own purposes.