The deserts of Australia or the Australian deserts cover about , or 18% of the Australian mainland, but about 35% of the Australian continent receives so little rain, it is practically desert. Collectively known as the Great Australian desert, they are primarily distributed throughout the Western Plateau and interior lowlands of the country, covering areas from South West Queensland, Far West region of New South Wales, Sunraysia in Victoria and Spencer Gulf in South Australia to the Barkly Tableland in Northern Territory and the Kimberley region in Western Australia. By international standards, the Great Australian desert receives relatively high rates of rainfall or around on average, but due to the high evapotranspiration it would be correspondingly arid. No weather station situated in an arid region records less than of average annual rainfall. The deserts in the interior and south lack any significant summer rains. The desert in western Australia is well explained by the little evaporation of the cold sea current of the West Australian Current, of polar origin, which prevents significant rainfall in the interior of the continent. About 40% of Australia is covered by dunes. Australia is the driest inhabited continent, with the least fertile soils. In addition to being mostly uninhabited, the Great Australian Desert is diverse, where it consists of semi-desert grassy or mountainous landscapes, xeric shrubs, salt pans, gibber (stony) deserts, red sand dunes, sandstone mesas, rocky plains, open tree savannahs and bushland with a few rivers and salt lakes, which are mostly seasonally dry and often have no outflow in the east. The 3 million km² desert is among the least modified in the world. The Australian desert has the largest population of feral camels in the world. History Geological The area's geology spans a geological time period of over 3.8 billion years, therefore featuring some of the oldest rocks on earth. There are three main cratonic shields of recognised Archaean age within the Australian landmass: The Yilgarn, the Pilbara and the Gawler cratons. Several other Archaean-Proterozoic orogenic belts exist, usually sandwiched around the edges of these major cratonic shields. The history of the Archaean cratons is extremely complex and protracted. The cratons appear to have been accumulated to form the greater Australian landmass in the late Archaean to meso-Proterozoic, (~2400 Ma to 1,600 Ma). Chiefly the Capricorn Orogeny is partly responsible for the assembly of the West Australian landmass by connecting the Yilgarn