snow barchan

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• Dune — For other uses, see Dune (disambiguation). Erg Chebbi, Morocco …   Wikipedia

• Karakum Desert — or Kara Kum Desert Desert area, Central Asia. Located in Turkmenistan, it is bounded to the east by the Amu Darya valley. It can be divided into three major regions: the elevated and wind eroded Trans Unguz in the north, the low lying central… …   Universalium

• Sastruga — ] Sastrugi or zastrugi are sharp irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in polar and temperate snow regions. They differ from sand dunes in that the ridges are parallel to the prevailing… …   Wikipedia

• Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …   Wikipedia

• Desert — Not to be confused with dessert. This article is about dry terrain. For the act of abandoning or withdrawing support, see desertion. For other uses, see Desert (disambiguation) …   Wikipedia

• Olympia Undae — Mars Global Digital Dune Database MC 1 map showing the North Polar Sand Sea. Olympia Undae is the area with dune coverage between 120° to 240°E longitude …   Wikipedia

• Arabian Desert — 1. a desert in Egypt between the Nile valley and the Red Sea. ab. 80,000 sq. mi. (207,000 sq. km). 2. the desert region in the N part of the Arabian peninsula. * * * Desert region, Arabian Peninsula. It covers about 900,000 sq mi (2,330,000 sq… …   Universalium

• Namib — ▪ desert, Africa Introduction Portuguese  Namibe,    a cool coastal desert extending for 1,200 miles (1,900 kilometres) along the Atlantic coast from Namibe (formerly Moçâmedes) in Angola southward across Namibia to the Olifants River in the Cape …   Universalium