Erg Chebbi 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 village of Merzouga, about ten hours from Marrakesh or Fez, is located near the edge of the dunes. The dunes are a popular tourist destination.