The Simpson Desert is the largest parallel dune desert in the world with numerous dunes some reaching 40 metres. The highest sand dune is Nappanerica Sand Dune also called the The Big Red. The Simpson Desert covers 150,000 square kilometres. Travel is very difficult and you need to be self sufficient and be using a well equipped 4WD.
The desert has a range of habitats including spinifex grasslands, gidgee, woodlands and coolabah flood outs. The only source of natural water are Dalhousie Springs and the main spring is about 150 metres by 50 metres and provides a contrast to the dry desert.
The Approdinna Attora Knolls are two flat topped hills with with white gypseous rock on the top and make for a good landmark against the sand dunes. South of the knolls is the Wolporican Soak a source of freshwater that provided water for the original inhabitants the Wangkangurru people.