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Rain seldom falls in this region and aside from a handful of permanent waterholes, surface water is absent at all times except after heavy rain. Most of the territory is flat sandy or stony desert with a sparse covering of scrub or tussock grasses. Average rainfall varies from one area to another and is quoted at 100 to 350 mm per year (between 4 and 14 inches) but is highly unpredictable. There are no permanent watercourses. The general trend is for run-off to flow inland, but there is insufficent rainfall to produce any marked drainage pattern. SEE ALSO
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