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Sand Dunes And Acacia Tree, Namib Desert, Namibia

Sand Dunes And Acacia Tree, Namib Desert, Namibia (Nature)

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Tags: desert (51 pics)

The Namib Desert is a desert in Namibia and southwest Angola that forms part of the Namib-Naukluft National Park. The name "Namib" is of Nama origin and means vast.

The desert occupies an area of around 80 900 kmĀ² (31 200 square miles), stretching about 1000 miles (1,600 km) along the Atlantic Ocean coast of Namibia. Its east-west width varies from 30 to 100 miles (50-160 km). The Namib Desert also reaches into southwest Angola. It is one of the 500 distinct physiographic provinces of the South African Platform physiographic division.

Having endured arid or semi-arid conditions for at least 55 million years, it is considered to be the oldest desert in the world. The Namib's aridity is caused by the descent of dry air of the Hadley Cell, cooled by the cold Benguela current along the coast. It has less than 10 mm (0.4 inches) of rain annually and is almost completely barren.

A number of unusual species of plants and animals are found only in this desert. One of these is Welwitschia mirabilis, one of the most unusual species. Welwitschia is a shrub-like plant, but grows just two long strap-shaped leaves continuously throughout its lifetime. These leaves may be several meters long, gnarled and twisted from the desert winds. The taproot of the plant develops into a flat, concave disc in age. Welwitschia is notable for its survival in the extremely arid conditions in the Namib, sometimes deriving moisture from the coastal sea fogs.

Although the desert is largely unpopulated and inaccessible, there are year-round settlements at Sesriem, close to the famous Sossusvlei and a huge group of sand dunes, which at more than 300 meters high are among the tallest sand dunes in the world. The complexity and regularity of dune patterns in its dune sea have attracted the attention of geologists for decades. They still remain poorly understood.


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