Australia

Australia is a nation-state on the planet Earth. The world's smallest continent, the majority of it seems to consist of semi-arid or desert regions known as the Outback. The majority of the funa and flora is unique to country, and all of it deadly to humans, most notably the infamous and murderous dropbears.

In some continuties at least, the Australian accent is supposedly very similar to that of the inhabitants of the planet Nebulon, or vice versa.

Animated continuity
After the initial Decepticon threat was repulsed, Spike Witwicky wrote in his journal that "all of the world's governments" were assisting the Autobots' attempts to return to Cybertron. This would presumably include Australia.

Super-God Masterforce animated series
The Decepticons built an underwater base off the coast of Australia, their construction efforts causing increased volcanic activity and earthquakes that damaged the city of Sydney, which then drew the attention of the Autobot Godmaster Lightfoot. While the Headmaster Junior performed rescue operations in Sydney, Ginrai and Lightfoot fought against the threat of King Poseidon.

Energon
The West Australian outback was the site of Alterenergy's 01 Source Exploratory Excavation/Drilling Operation, where both Dr. Brian Jones and his son Kicker worked, the mining drawing both a group of protesters including Alexis and a group of Terrorcon searching for Energon.