Australia is an island continent of approximately 7.7 million square kilometres, making it the sixth-largest country in the world. Located between the Indian Ocean and the South Pacific Ocean, it is the oldest, lowest (apart from Antarctica), and driest continent. Because of its unique and varied geography, it is an archaeologist’s delight, with landforms dating back millions of years. Australia is mostly flat, but has some notable mountains and long beaches. Canberra is the capital.