Wallaroo is a port town on the western side of Yorke Peninsula in South Australia, 160 kilometres (100 mi) northwest of Adelaide. It is one of the three Copper Triangle towns famed for their historic shared copper mining industry, and known together as "Little Cornwall", the other two being Kadina, about 8 kilometres (5 mi) to the east, and Moonta, about 18 kilometres (11 mi) south. In 2016, Wallaroo had a population of 3,988 according to the census held.

The Yorke Peninsula, known as Guuranda by the original inhabitants, the Narungga people, is a peninsula located northwest and west of Adelaide in South Australia, between Spencer Gulf on the west and Gulf St Vincent on the east. The peninsula is separated from Kangaroo Island to the south by Investigator Strait.