Area & population
Australia, with the area of over 7,500,000 square kilometers, is the only entire continent governed by one nation. The mainland is both the largest island and at the same time the smallest and the flattest continent on Earth. The highest point on the mainland, Mount Kosciusko, is only 2,228 meters.
It has, however, a relatively small population with a little over 23.5 million people (August 2014). Statically there are less than 3 people per km2 (2.91 /km2). That makes Australia the 3rd least densely populated country in the world. Only Mongolia, Western Sahara, Suriname, Mauritania and Botswana have fewer people per square kilometer than Australia.
It is also worth noticing that most of the Aussies live in major cities. The population of Sydney is 4.4 million (21%), Melbourne 4 million (19%), Brisbane 2.1 million (10%), Perth 1.7 million (8.5%), Adelaide 1.2 million (5.5%). That means that around 36% of the population lives in other smaller cities or towns or in the outback.