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The Richat Structure in the Sahara Desert of Mauritania view from Landsat-7 satellite(source: USGS, 2008 ).

The Eye Of Sahara, The Richat Structure, Mauritania

  The Richat Structure, also known as The Eye of the Sahara and Guelb er Richat, is a prominent circular feature in the Sahara near Ouadane, west–central Mauritania.           The Richat Structure is a deeply eroded, slightly elliptical dome with a diameter of 40 kilometres (25 mi). The sedimentary rock exposed in this dome

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