The borders of countries are decided by people. But oceans usually form the op borders of continents. What about islands? Islands are often considered part of the continent they are closest to. Greenland, for example, is politically part of Europe. However, it belongs geographically to the continent of North America. Oceania is a name used to describe many islands in the Pacific Ocean. Most of these islands aren't part of any continent. The islands of Oceania include Fiji, Tonga and Samoa. Australia, a continent and a country, is bordered by the Indian Ocean to the west and the Pacific Ocean to the east. Of all the continents, Australia is the smallest. But, as a country, it is the sixth largest in the world. The biggest cities in Australia are Sydney, Melbourne, Brisbane and Perth. Much of this continent is called the "outback." The outback is a remote and partly desert region in the interior, or away from the coast. Koalas, kangaroos, emus and platypus are some of the unique animals that call Australia home. Which of these is a true statement? Australia is a continent that includes three countries. Australia is the sixth largest continent. No country is larger than Australia. No continent is smaller than Australia.