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Richat Structure
The Richat Structure, which is commonly referred to as the “Eye of the Sahara,” is a prominent circular feature located in the Sahara region near Ouadane, west-central Mauritania.
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This structure was initially interpreted as an asteroid impact structure due to its high degree of circularity, but geologists have ruled out this theory, referring to the whole formation as a highly symmetrical and deeply eroded geologic dome.
No evidence has been found to suggest shock metamorphism or any hypervelocity extraterrestrial impact. Studies of its origin are still ongoing.