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Dried lake basin. Aerial photograph of sand deposited on the bed of the dried-out Lake Torrens, Central Australian Desert, Australia. This fan-shaped delta shows the deposition of sand carried by a river (upper right), which runs into Lake Torrens. The lake and river are arid for most of the year, but during heavy rains and flooding, water is brought from hundreds of miles away, filling the lake basin. (KEYSTONE/SCIENCE PHOTO LIBRARY/Bernhard Erdmaier) === ===