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The Nullarbor Plain is the vast area of flat, almost treeless, arid or semi-arid country immediately north of the Great Australian Bight. The word Nullarbor is derived from the Latin nullus for 'nothing' or 'no one' and arbor for 'tree', and is pronounced "NULL-uh-bore" (). The Aboriginal name for the area is 'Oondiri' meaning 'the waterless'. It is the world's largest single piece of limestone, and occupies an area of about 200,000 km² (77,200 sq miles). At its widest point, it stretches about 1200 km from east to west between South Australia (SA) and Western Australia (WA).