Sahel: Wikis

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From Wikipedia, the free encyclopedia

See also Sahel, Tunisia, a region of eastern Tunisia, and Sahel (Eritrea), a former province of Eritrea.
The Sahel forms a belt up to 1000 km wide, spanning Africa from the Atlantic Ocean to the Red Sea.

The Sahel is the ecoclimatic and biogeographic zone of transition between the Sahara desert in the North and the Sudanian savannas in the south. It stretches across the north of the African continent between the Atlantic Ocean and the Red Sea. The Sahel covers parts of the countries of Senegal, Mauritania, Mali, Burkina Faso, Niger, Nigeria, Chad, Sudan, Somalia, Ethiopia, and Eritrea.

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Geography

Camels trample the soil in the semiarid Sahel as they move to water holes such as this one in Chad.

The Sahel runs 3862 km (2,400 miles) from the Atlantic Ocean in the west to the Red Sea in the east, in a belt that varies from several hundred to a thousand kilometers (620 miles) in width, covering an area of 3,053,200 square kilometers (1,178,800 square miles). It is a transitional ecoregion of semi-arid grasslands, savannas, steppes, and thorn shrublands lying between the wooded Sudanian savanna to the south and the Sahara to the north.[1]

The lush green of the rainy season Sahelian forest, along the Bamako-Kayes Road in Mali. The trees in foreground are Acacia. Note the large Baobab tree

The topography of the Sahel is mainly flat, and the region mostly lies between 200 and 400 meters elevation. Several isolated plateaus and mountain ranges rise from the Sahel, but are designated as separate ecoregions because their flora and fauna are distinct from the surrounding lowlands. Annual rainfall varies from around 200 mm in the north of the Sahel to around 600 mm in the south.[1]

Over the history of Africa the region has been home to some of the most advanced kingdoms benefiting from trade across the desert. Collectively these states are known as the Sahelian kingdoms.

Flora and fauna

The Sahel is mostly covered in grassland and savanna, with areas of woodland and shrubland. Grass cover is fairly continuous across the region, dominated by annual grass species such as Cenchrus biflorus, Schoenefeldia gracilis, and Aristida stipoides. Species of Acacia are the dominant trees, with Acacia tortilis the most common, along with Acacia senegal and Acacia laeta. Other tree species include Commiphora africana, Balanites aegyptiaca, Faidherbia albida, and Boscia senegalensis. In the northern part of the Sahel, areas of desert shrub, including Panicum turgidum and Aristida sieberana, alternate with areas of grassland and savanna. During the long dry season, many trees lose their leaves, and the predominantly annual grasses die.

The Sahel was formerly home to large populations of grazing mammals, including the Scimitar-horned Oryx (Oryx dammah), Dama Gazelle (Gazella dama), Dorcas Gazelle (Gazella dorcas) and Red-fronted Gazelle (Gazella rufifrons), and Bubal Hartebeest (Alcelaphus busephalus buselaphus), along with large predators like the African Wild Dog (Lycaon pictus), Cheetah (Acinonyx jubatus), and Lion (Panthera leo). The larger species have been greatly reduced in number by over-hunting and competition with livestock, and several species are vulnerable (Dorcas Gazelle and Red-fronted Gazelle), endangered (Dama Gazelle, African Wild Dog, cheetah, lion), or extinct (the Scimitar-horned Oryx is probably extinct in the wild, and the Bubal Hartebeest is extinct).

The seasonal wetlands of the Sahel are important for migratory birds moving within Africa and on the African-Eurasian flyways.[1]

Early agriculture

The first instances of domestication of plants for agricultural purposes in Africa occurred in the Sahel region circa 5000 BCE, when sorghum and African Rice (Oryza glaberrima) began to be cultivated. Around this time, and in the same region, the small Guineafowl were domesticated.

Around 4000 BCE the climate of the Sahara and the Sahel started to become drier at an exceedingly fast pace. This climate change caused lakes and rivers to shrink rather significantly and caused increasing desertification. This, in turn, decreased the amount of land conducive to settlements and helped to cause migrations of farming communities to the more humid climate of West Africa.[2]

Transhumance

Sahel people with livestock and azawakh dogs

Traditionally, most of the people in the Sahel have been semi-nomads, farming and raising livestock in a system of transhumance, which is probably the most sustainable way of utilizing the Sahel. The difference between the dry north with higher levels of soil-nutrients and the wetter south is utilized so that the herds graze on high quality feed in the North during the wet season, and trek several hundred kilometers down to the south, to graze on more abundant, but less nutritious feed during the dry period. Increased permanent settlement and pastoralism in fertile areas has been the source of conflicts with traditional nomadic herders.

Sahelian kingdoms

The Sahelian kingdoms were a series of empires, based in the Sahel, which had many similarities. The wealth of the states came from controlling the Trans-Saharan trade routes across the desert. Their power came from having large pack animals like camels and horses that were fast enough to keep a large empire under central control and were also useful in battle. All of these empires were also quite decentralized with member cities having a great deal of autonomy. The first large Sahelian kingdoms emerged after 750, and supported several large trading cities in the Niger Bend region, including Timbuktu, Gao, and Djenné.

The Sahel states were limited from expanding south into the forest zone of the Ashanti and Yoruba as mounted warriors were all but useless in the forests and the horses and camels could not survive the heat and diseases of the region.

20th-century droughts

There was a major drought in the Sahel in 1914, caused by annual rains far below average, that caused a large-scale famine. The 1960's saw a large increase in rainfall in the region, making the Northern drier region more accessible. There was a push, supported by governments, for people to move northwards, and as the long drought-period from 1968 through 1974 began, the grazing quickly became unsustainable, and large-scale denuding of the terrain followed. Like the drought in 1914, this led to a large-scale famine, but this time it was somewhat tempered by international visibility and an outpouring of aid. This catastrophe led to the founding of the International Fund for Agricultural Development.

See also

References

  1. ^ a b c Magin, Chris (2001). "Sahelian Acacia savanna". Terrestrial Ecoregions. World Wildlife Fund. http://www.worldwildlife.org/wildworld/profiles/terrestrial/at/at0713_full.html. Retrieved 2009-12-07. 
  2. ^ O'Brien, Patrick K., ed (2005). Oxford Atlas of World History. New York: Oxford University Press. pp. 22–23. 

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Travel guide

Up to date as of January 14, 2010
(Redirected to Saharan Africa article)

From Wikitravel

Africa : Saharan Africa
Contents

Saharan Africa is a region of Africa.

Countries of Saharan Africa
Countries of Saharan Africa
Chad
Mali
Mauritania
Niger
Sudan
The Sahara
The Sahara

Cities

There is a very low population in this area of Africa and cities and rare and far between but in order here are the main ones.

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1911 encyclopedia

Up to date as of January 14, 2010
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From LoveToKnow 1911

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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

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English

Etymology

From Arabic sahil "border of the desert".

Proper noun

Singular
Sahel

Plural
-

Sahel

  1. a region in Africa, between the Sahara to the north and a more humid zone (Sudan) to the south.

Derived terms

Related terms

Anagrams


German

Proper noun

Sahel f

  1. Sahel

Related terms


Simple English

File:Map
The area marked in yellow shows the Sahel zone in Africa

The Sahel is a narrow belt of land in West Africa. It is a strip of dry land about 5500 kilometres long and 450 kilometres wide. It lies at the southern edge of the Sahara Desert. It is located between the dry desert land to the north and the forest areas to the south. The Sahel has a tropical semi-arid climate. The temperature is high throughout the year. There is little rainfall in the Sahel (300mm-600mm), It is concentrated during summer months and can be unreliable. It may be very dry in some years, especially if a large area of low pressure, which brings rain, is not carried North over the Sahel by strong winds.

The Sahel is the Arab word for 'edge' or 'shore'.

The Sahel is facing a big problem, Desertification .

The distribution of rainfall in the Sahel region is uneven. From 1970 onwards, the rainfall is below average. The Sahel is becoming drier on the whole. The problem of drought affects most of the countries. As a result, crops and animals die. There is no vegetation to protect the soil. The topsoil is removed by flash floods and strong wind. This leads to soil erosion. Finally the desert spread towards the surrounding areas.

With better medical services, the birth rate increases and the death rate decreases in the Sahel. As a result, the population in the Sahel is large. To meet the ever increasing demand for firewood, a lot of woody vegetation has been cut down. More land has been barren. We called this deforestation. People farm intensively in order to grow more crops, the soil becomes dry and infertile. In the long run, no crops can be grown. We called this over- cultivation. People keep a large number of animals for food. However, the grass cannot support so many grazed animals. We called this over- grazing. Finally the desert spread towards the surrounding areas.


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