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  • Seif dunes are a type of sand dune that have a linear shape and a uniform orientation, perpendicular to the prevailing wind direction. 
  • They are usually taller and narrower than other types of sand dunes and can reach heights of hundreds of meters.
  • Seif dunes are characterized by a slip face, a steep leeward slope that is created by the wind's action in removing sand from the crest and depositing it at the base. 
  • They also typically have a well-defined crest and a relatively flat windward slope.
  •  Seif dunes are found in desert regions with limited vegetation and are one of the fastest moving types of sand dunes, moving as much as tens of meters per year.
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