For 10 points, name this country whose cities include Perth, Canberra, and Sydney.
This nation's capital city was designed by Walter Burley Griffin and Marion Mahoney Griffin. The Arafura Sea is directly north of this country's Gulf of Carpenteria. The south of this country is home to the Nullarbor Plain, which is north of its "Great Bight." Hobart and Darwin are the capitals of two of its states. Deserts in this country include the Gibson, Great Sandy, and Great Victoria. A giant sandstone formation in this country is called Uluru by its aboriginal inhabitants, and is also known as Ayers Rock. For 10 points, name this country whose cities include Perth, Canberra, and Sydney.
This nation's capital city was designed by Walter Burley Griffin and Marion Mahoney Griffin.
Commonwealth of {Australia}