Western Australia

 was a state in Australia dominated by desert. Nat Simms wandered around the deserts solo for a time — until he came to his senses and returned to Perth before his supplies ran out. (PROSE: Invasion of the Cat-People)

By the early 1970s, some fruit from Western Australia became contaminated with mercurial dioxide, due to fallen particles of dust from outer space. These were later stored in the C19's Vault. (PROSE: The Scales of Injustice)

At least some of Skylab fell near the town of Esperance. The Tenth Doctor spent some time there rebuffing a Zalphon invasion with a young lad named Harvey. (PROSE: Bennelong Point)