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The Eye of the Sahara
This huge depression, the circular shape and stretches 25 miles wide, like a bull's-eye mark in the middle of the desert regions of Mauritania planar features. Can be seen from space, it has been a landmark of the astronauts, because the first task.
The eye is no target practice, the results of foreigners, but the formation of wind erosion at different levels of sediment, quartzite and other rocks at different depths.
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