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Nabta Playa: A mysterious stone circle that may be the world's oldest astronomical observatory
But originally, Nabta Playa consisted of dozens of upright stones, each a few feet high, in the desert about 60 miles (100 km) west of the Nile. In addition to a pile of stones above a central ...
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Wetlands are disappearing quickly across the United States
highly saline playas in desert basins such as Sevier Lake and the Bonneville Salt Flats. Regardless of how Utah’s wetlands are classified, wetlands are rare, the survey notes. Vegetated wetlands ...