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Wikipedia: In physical geography, a dune is a hill of sand built by aeolian processes. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind.
![[Coastal dunes in Curonian spit.]](http://images.ookaboo.com/photo/s/Curonian_spit_s.jpg "Coastal dunes in Curonian spit.")
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![[Some dunes are suitable for dune-boarding]](http://images.ookaboo.com/photo/s/Dune_boarding_s.jpg "Some dunes are suitable for dune-boarding")
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 from Audriusa |
 from Rick McCharles |
![[Trees are planted instead of sand fences to reduce sand accumulating in a UAE highway]](http://images.ookaboo.com/photo/s/Highway_sand_dune_s.jpg "Trees are planted instead of sand fences to reduce sand accumulating in a UAE highway")
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![[Sand dunes with scattered vegetation in UAE]](http://images.ookaboo.com/photo/s/Sanddune_s.jpg "Sand dunes with scattered vegetation in UAE")
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 from Jpogi |
from Jpogi |
![[Sand dunes in Death Valley National Park]](http://images.ookaboo.com/photo/s/Send_dunes_in_death_valley_national_park_s.jpg "Sand dunes in Death Valley National Park")
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![[A footbridge provides beach access and protects dunes]](http://images.ookaboo.com/photo/s/Beach_access_s.jpg "A footbridge provides beach access and protects dunes")
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from Mila Zinkova |
from Rklawton |
![[Avalanche deposits on a crest of the Kelso Dunes, Mojave National Preserve, California]](http://images.ookaboo.com/photo/s/KelsoDunesAvalancheDeposits_s.jpg "Avalanche deposits on a crest of the Kelso Dunes, Mojave National Preserve, California")
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![[Sand dunes of Khongoryn Els, Gurvansaikhan NP, Mongolia.]](http://images.ookaboo.com/photo/s/KhongorynEls_s.jpg "Sand dunes of Khongoryn Els, Gurvansaikhan NP, Mongolia.")
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from Wilson44691 |
from Doron |
![[Erg Awbari (Idehan Ubari) in the Sahara desert region of Fezzan in Libya]](http://images.ookaboo.com/photo/s/Libya_4608_Idehan_Ubari_Dunes_Luca_Galuzzi_2007_s.jpg "Erg Awbari (Idehan Ubari) in the Sahara desert region of Fezzan in Libya")
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![[Parabolic dune in Hoffmaster State Park]](http://images.ookaboo.com/photo/s/Hoffmaster_parabolic_dune_s.jpg "Parabolic dune in Hoffmaster State Park")
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from Lucag |
from Rmhermen |
![[Satellite image of dune fields near Luís Correia.]](http://images.ookaboo.com/photo/s/Brazilian_Dune_Fields_s.jpg "Satellite image of dune fields near Luís Correia.")
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from Originalwana |
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