South Australia is the fourth largest ofAustralia's
states and territories, and is composed of an arid to semi-arid terrain giving way to low mountain ranges.
The Mount Lofty-Flinders Ranges extend some 497 miles (800 km) across South Australia, and are the state's most important (albeit not tallest) mountain system.
The highest point of South Australia is Mount Woodroffe at 4,708 ft (1,435 m) located in the Musgrave Ranges in the extreme northwestern portion of the state.
Fronted by cliffs of the Great Australia Bight, the Nullarbor Plain makes up the southwestern portion of South Australia, and is the world's largest single piece of limestone.
The Nullarbor Plain expands some 77,000 sq. miles (200,000 sq. km) and stretches 684 miles (1,100 km.) west into the state of Western Australia.
Significant bodies of water include Lakes Eyre, Gairdner, Torrens, and Frome, and the Murray River.
The lowest point of the South Australia is Lake Eyre at −16 m (−52.5 ft).