Nullarbor Plain

Nullarbor Plain (Latin: nullus, "no", and arbor, "tree") is an area of flat, dry land in southern Australia on the coastline of the Great Australian Bight.

It is the world's largest single piece of limestone, and occupies an area of about . At its widest point, it stretches about  from east to west between South Australia (SA) and Western Australia (WA). 

As to what causes these huge and distinctive limestone areas, no-one knows. Perhaps it is significant that one of the best-known area, the Yukatan, was in or near a hit by a huge meteorite. As much as 50% of the world's hydrocarbon reserves are in carbonate rock, and much of this is in porous karst systems.Ford, Derek 2007. Jovan Cvijić and the founding of karst geomorphology. Environmental Geology. 51 (5): 675–684.

 References 

 Further reading 
 Bolam, Anthony Gladstone, 1893–1966. The trans-Australian wonderland  Melbourne : Modern Printing, (many editions in the early 20th century)
 Edmonds, Jack  1976. Nullarbor crossing: with panorama  photographs by Brian Gordon. Perth. West Australian Newspapers, Periodicals Division. 

 Other websites 

 Nullarbor Net
 Information about crossing the Nullarbor 

Category:Regions of Australia
Category:Geography of South Australia
Category:Deserts of Australia
Category:Geography of Western Australia