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20070930-NamTso-2-DZ.jpg
A hiker walks to the edge of Nam-tso, a lake that sometimes has water the shade of turquoise.  Nam-tso Lake is the second-largest saltwater lake in China, at over 70 kilometers in length and is located on the Tibetan plateau at an elevation of 4718 meters above sea level.  Photograph by Douglas ZImmerman