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The Richat Structure, or Guelb er Richât (Arabic: قلب الريشات, romanized: Qalb ar-Rīšāt, Hassaniyya: [galb er.riːʃaːt] ⓘ), is a prominent circular geological feature in the Adrar Plateau of the Sahara. It is located near Ouadane in the Adrar Region of Mauritania.
Guelb er Richat structure. With a diameter of almost 50 kilometers (31 mi), it has become a landmark for Space Shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be merely a symmetrical uplift (circular anticline) that has been laid bare by erosion.
The concentric Guelb er Richat is a prominent feature of the north-central region. Kediet ej Jill , near the city of Zouîrât , has an elevation of 915 metres (3,000 ft) and is the highest peak. The plateaus gradually descend toward the northeast to the barren El Djouf , or "Empty Quarter," a vast region of large sand dunes that merges into ...
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Obverse of 100 ouguiya note issued in 2011 with Eastern Arabic numerals. The reverse features text in French and Western Arabic numerals. New banknotes and new coins were introduced in 2004. These notes have completely new fronts and the vignettes on the backs have been redesigned to accommodate the reduction in size.
Ouadane or Wādān (Arabic: وادان) is a small town in the desert region of central Mauritania, situated on the southern edge of the Adrar Plateau, 93 km northeast of Chinguetti. The town was a staging post in the trans-Saharan trade and for caravans transporting slabs of salt from the mines at Idjil.
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