The Commonwealth of Australia is a country in the southern hemisphere comprising the mainland of the world's smallest continent, the major island of Tasmania, and a number of other islands in the Indian and Pacific Oceans. The neighbouring countries are Indonesia, East Timor, and Papua New Guinea to the north, the Solomon Islands, Vanuatu, and New Caledonia to the north-east, and New Zealand to the south-east. Australia consists of six states, two major mainland territories, and other minor territories. The states are New South Wales, Queensland, South Australia, Tasmania, Victoria, and Western Australia. The two major mainland territories are the Northern Territory and the Australian capital Territory.
By far the largest part of Australia is desert or semi-arid. Australia is the flattest continent, has the oldest and least fertile soils, and is the driest inhabited continent. Only the south-east and south-west corners of the continent have a temperate climate. Most of the population lives along the temperate south-eastern coastline. The landscapes of the northern part of the country, with a tropical climate, consist of rainforest, woodland, grassland, mangrove swamps, and desert. Because of the continent's great age, its extremely variable weather patterns, and its long-term geographic isolation, much of Australia's flora and fauna is unique and diverse. Long-term concerns include pollution, particularly depletion of the ozone layer, and management and conservation of coastal areas, especially the Great Barrier Reef. World famous for its natural wonders and wide open spaces (beaches, deserts and "the bush" or "the Outback"), Australia is ironically one of the world's most highly urbanised countries and is well known for the cosmopolitan attractions of its globally significant cities, such as Sydney, Melbourne, Brisbane, Perth, Adelaide, Hobart and the Australian capital city Canberra. Australia is also a major tourist destination, and is one of the world's wealthiest countries. The country is renowned worldwide for its vast, untouched landscape and its unique culture.
