عرق الشبي (Erg Chebbi)
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My travel in Morocco (December 2009 - January 2010)
"Erg Chebbi (Arabic: عرق الشبي), in southeastern Morocco, is one of two Saharan ergs in the northwest African nation (the other is Erg Chigaga near M'hamid). Its distinctive ergs — large dunes formed by wind-blown sand — reach up to 150 meters high, and form a composite erg 22 km long (north-south) and 5 km wide.
The locals believe that these dunes were sent as punishment for turning away a weary traveler from the desert. They say that shortly thereafter, the gods made the dunes pile up outside their town as a lesson never to send away another needy wanderer."