Australia is located in Oceania and is the sixth largest country by area. Its capital is Canberra and its population of over 20 million people lives mostly in coastal cities like Sydney, Melbourne, and Brisbane. The climate varies across Australia but much of the country is arid or semi-arid desert, with temperate areas in the southeast and tropical climate in the north. The flora includes over 22,000 plant species, over 90% of which are indigenous, and the fauna is diverse with iconic marsupials and venomous animals.