Australia officially the Common wealth of Australia, is an Oceanian country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the world's sixth-largest country by total area. Neighbouring countries include Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. Australia has the third highest number of international students in the world behind only the United Kingdom and the United States. The population of Australia is 23 Million. Australia has 7 of the top 100 universities in the world with over 22,000 courses across 1,100 institutions. Australia has five of the 30 best cities in the world for students. Australia is ranked as the fourth happiest country in the world behind only Norway, Denmark and Sweden.