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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 Richât: 28 November 2020 50 ouguiya Violet Ibn Abbas mosque, Nouakchott Teapot; musical instruments 28 November 2017 100 ouguiya Green Tower Cattle 28 November 2017 200 ouguiya Yellow Tower Camels 28 November 2017 500 ouguiya Blue Tower Trawler; fish 28 November 2017 1,000 ouguiya Brown Tower Locomotive of an ore train 28 November 2017
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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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.
The Adrar is an arid plateau, known for its gorges, regs (stony deserts) and sand dunes.Structurally the Adrar is a low central massif which rises to over 700 m (2,297 ft) above sea level just east of Atar near the Amojjar Pass on the track to Chinguetti, then loses elevation and becomes subsumed by dunes to the south and east.
The glossary of Arabic toponyms gives translations of Arabic terms commonly found as components in Arabic toponyms. A significant number of them were put together during the PEF Survey of Palestine carried out in the second half of the 19th century.