<Tr> <Td_colspan="2"> The IBRA boundaries of the Simpson Desert </Td> </Tr> <Tr> <Td_colspan="2"> Wikimedia Commons: Simpson Desert </Td> </Tr> <P> The Simpson Desert is a large area of dry, red sandy plain and dunes in Northern Territory, South Australia and Queensland in central Australia . It is the fourth largest Australian desert, with an area of 176,500 km (68,100 sq mi) and is the world's largest sand dune desert . </P> <P> The desert is underlain by the Great Artesian Basin, one of the largest inland drainage areas in the world . Water from the basin rises to the surface at numerous natural springs, including Dalhousie Springs, and at bores drilled along stock routes, or during petroleum exploration . As a result of exploitation by such bores, the flow of water to springs has been steadily decreasing in recent years . It is also part of the Lake Eyre basin . </P>

Where is the simpson desert located on a map