Sahel

 

(sähĕl') , name applied to the semiarid region of Africa between the Sahara to the north and the savannas to the south, extending from Senegal and Mauritania on the west, through Mali, Burkina Faso, Niger, N Nigeria, Chad, and Sudan, to Ethiopia and Eritrea on the east. Beginning in the late 1960s the Sahel was afflicted by a prolonged and devastating drought that further reduced the region's normally meager water supplies, shattered its agricultural economy, contributed to the starvation of an estimated 100,000 people, and forced the mass migration southward of many people. Although rainfall and international relief efforts helped, drought and famine affected the Sahel again in the mid-1980s and early 1990s.

See also Sahel, Tunisia, a region of eastern Tunisia.

The Sahel (from Arabic ساحل, sahil, shore, border or coast of the Sahara desert) is the boundary zone in Africa between the Sahara to the north and the more fertile region to the south, known as the Sudan (not to be confused with the country of the same name).

Geography

The Sahel is primarily savannah and runs 2,400 miles from the Atlantic Ocean to the Horn of Africa, changing from semi-arid grasslands to thorn savanna. 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.

The countries of the Sahel today include Senegal, Mauritania, Mali, Burkina Faso, Niger, Nigeria, Chad, Sudan, and Eritrea.

Environment

About 12,500 years ago, the Sahel was a part of the Sahara desert, and was covered in sand dunes which have shaped the landscape that we see today. The Sahel receives about 150–500 mm (6–20 in) of rainfall a year, primarily in the monsoon season. The rainfall is characterized by great variation from year to year and from decade to decade. The most important limitations to land productivity in the Sahel are water and soil fertility. Soils in the Sahel are mostly acidic (which results in aluminum toxicity to plants), and are very low in nitrogen and phosphate.

There is a strong correlation between rainfall in the Sahel region and intense hurricane activity in the Atlantic^[1].

Transhumance

Traditionally, most of the people in the Sahel have been semi-nomads, farming and raising cattle 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.

Droughts

Further information: Sahel drought

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 kicked in, 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

• Trans-Sahelian Highway
• Meningitis#Epidemiology
• Sahelian kingdom

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See also Continents of the world

References

frp:Sahèl afriquen

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