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This false-color, high-resolution satellite photo shows the Turpan Depression, nestled at the foot of China's Bogda Mountains, south of the oasis city of Turpan. A strange mix of salt lakes and sand dunes, this fault-bounded trough is the lowest exposed surface in China. At the center of the basin lies Ayding Lake (bottom left), which is the third lowest exposed point on the earth's surface at -154 m (-505 ft). Image courtesy of USGS.