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| | Summary: Dunes, Linear/Seif |
 | | Linear dunes cover more desert area than any other type of dune, especially in central Australia, southern Africa, the southwestern Arabian Peninsula, and parts of the Sahara, but they are not as common (in the sense of occurring in almost every desert) as are the crescentic dunes. |
 | | Nonetheless, the long axes of linear dunes are aligned generally within 15° of the prevailing wind or with the resultant drift direction of the local winds. |
 | | Linear dunes can be continuous for many tens and even hundreds of kilometers, and they can form parallel barriers to cross-country movement except down the interdunal passages, which are parallel to the long axes of the dunes (see photo). |
| www.tec.army.mil /research/products/desert_guide/lsmsheet/lslinear.htm (864 words) |
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