Simpson Desert West of Diamantina River, Australia25.4S 138.2E
The Simpson Desert occupies approximately 176 500 square kilometers of central Australia. It is located within, and near the common boundaries of the Northern Territory, South Australia and Queensland states of Australia.
It is bounded to east by the Georgina and Diamantina Rivers, the latter of which is visible here to the right, with the ephemeral Lake Eyre to the south. Average annual rainfall is less than 5 inches (200 mm).
The Simpson Desert is an erg which contains the world’s longest parallel sand dunes. These north-south oriented dunes are static, held in position by vegetation. They vary in height from 3 metres in the west to around 30 metres on the eastern side.
Some of the heaviest rain in decades during 2009, and continuing into 2010, has seen the Simpson Desert burst into life and colour. Rain inundated Queensland’s north-west and Gulf regions. In total, 17 million megalitres of water entered the State’s western river systems leading to Lake Eyre. In 2010, researchers uncovered the courses of ancient river systems under the desert.