Australia is a country in Oceania.
Digger Harkness, otherwise known as Captain Boomerang, was born and raised in Korumburra. He was responsible for numerous robberies and break-ins, and has been doing so since he was 18. After robbing much of Australia, he decided to go to the United States of America to commit more robberies and was apprehended by the Flash while there.
Some people in Australia were considerated by the Wizard Shazam as his champion, but they were rejected as not worthy. Thaddeus Sivana found out about them in his search to find the Rock of Eternity.