seif dune

World English Dictionary
seif dune (seɪf)
 
n
(in deserts, esp the Sahara) a long ridge of blown sand, often several miles long
 
[seif, from Arabic: sword, from the shape of the dune]

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American Heritage
Science Dictionary
seif dune   (sāf, sīf)  Pronunciation Key 
A sharp-crested longitudinal sand dune or chain of sand dunes common to the Sahara and ranging up to 300 m (984 ft) in height and 300 km (186 mi) in length.
The American Heritage® Science Dictionary
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