The Simpson Desert, in Australia, is also known as 'The Big Red' due to the presence of dunes of red sand. The Simpson Desert is an erg which contains the world's longest parallel sand dunes. They vary in height from 3 metres in the west to around 30 metres on the eastern side. The most famous dune, Nappanerica, or, more popularly, Big Red (named by Simpson Desert traveler Dennis Bartell), is 40 metres in height.
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