Australia is the 6th largest country by land area, and the smallest continent. It has a low population of 23 million people despite its large size of 7.7 million square kilometers, around 15 times larger than Spain. The climate and geography varies significantly across Australia, from tropical rainforests in the north, to deserts in the interior, and bushland on the eastern coast. The Great Barrier Reef off the coast of Queensland is the world's largest reef system. Politically, Australia is made up of 6 states and 2 territories, each with their own capital city and unique industries and landscapes.