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Simpson Desert, 451 km (280 mi) wide by 547 km (340 mi) long, lies southeast of Alice Springs. At lower left is Lake Eyre, a salt lake below sea level. Its water level changes dramatically throughout the seasons. At the time this image was taken the lake was nearly dry. At lower right is the greenish Lake Blanche. Fields of linear sand dunes stretch north and east of Lake Eyre, shaped by prevailing winds from the south. The various sources and age of the sand can be determined by their color.

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