The Ninety Mile Desert is an area in the Australian state of

South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...

. It is described either as a desert or as a plain and which has been officially known as Coonalpyn Downs since 1949.

References

Deserts of South Australia {{SouthAustralia-geo-stub