The terrain consists largely of arid and semi-arid rangelands, with several low mountain ranges. The most important (but not tallest) is the Mount Lofty-Flinders Ranges system, which extends north about 800 kilometres (500 mi) from Cape Jervis to the northern end of Lake Torrens. The highest point in the state is not in those ranges; Ngarutjaranya (1,435 metres (4,708 ft)) is in the Musgrave Ranges in the extreme northwest of the state.
The south-western portion of the state consists of the sparsely inhabited Nullarbor Plain, fronted by the cliffs of the Great Australian Bight. Features of the coast include Spencer Gulf and the Eyre and Yorke Peninsulas that surround it. The Temperate Grassland of South Australia is situated to the east of Gulf St Vincent.
The principal industries and exports of South Australia are wheat, wine and wool. More than half of Australia's wines are produced in the South Australian wine regions which principally include Barossa Valley, Clare Valley, McLaren Vale, Coonawarra, the Riverland and the Adelaide Hills. See South Australian wine.
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