Simpson Desert is the largest national park in Queensland, Australia, 1495 km west of Brisbane. The park covers an area of more than 10,000 km² in the Simpson Desert surrounding Poeppel Corner west of Birdsville and Bedourie in the Central West region of the state.
The main features of the park are large sand dunes which can be 50 m high and around 1 km apart. Most dunes are between 10 and 35 m in height. The longest sand ridge is 200 km in length. One of the most prominent dunes is called 'Big Red' and is located 35 km west of Birdsville. The dunes started to form 30,000 years ago. Also found in the park are salt lakes and claypans.
Visitors are encouraged to visit from April to October to avoid extreme daytime temperatures and to travel within a two-vehicle party with long distance communications equipment. A 4WD vehicle is needed to travel through the park. There are no roads in the park.