, "coast, shore")
is the ecoclimatic and biogeographic realm
between the Sahara
to the north and the Sudanian savanna
to the south. Having a semi-arid climate
, it stretches across the south-central latitudes of Northern Africa
between the Atlantic Ocean and the Red Sea
. The name is derived from the Arabic term for "coast, shore"; this is explained as being used in a figurative sense (in reference to the southern edge of the vast Sahara).
However, such figurative use is unattested in Classical Arabic
, and it has been suggested that the word may originally have been derived from the Arabic word sahl
سهل "plain" instead.
The Sahel part of Africa includes from west to east parts of northern Senegal
, southern Mauritania
, central Mali
, northern Burkina Faso
, the extreme south of Algeria
, the extreme north of Nigeria
, the extreme north of Cameroon
and Central African Republic
, central Chad
, central and southern Sudan
, the extreme north of South Sudan
and the extreme north of Ethiopia
Historically, the western part of the Sahel was sometimes known as the Sudan region
(bilād as-sūdān بلاد السودان
"lands of the blacks"). This belt was roughly located between the Sahara and the coastal areas of West Africa
The lush green of the rainy season Sahelian forest, along the Bamako
Road in Mali
. The trees in the foreground are acacia. Note the large baobab
Herders with livestock and azawakh
dogs in the Sahel
The Sahel spans 5,900 km (3,670 mi) 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 (c. 600 miles) in width, covering an area of 3,053,200 square kilometers (1,178,850 sq mi). It is a transitional ecoregion
of semi-arid grasslands, savannas
, and thorn shrublands lying between the wooded Sudanian savanna
to the south and the Sahara
to the north.
The topography of the Sahel is mainly flat; most of the region lies between 200 and 400 meters (660 and 1,310 ft) in 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 100–200 mm (4–8 in) in the north of the Sahel to around 700–1,000 mm (28–39 in) in the south.
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)
, red-fronted gazelle (Gazella rufifrons)
, the giant prehistoric buffalo (Pelorovis)
and Bubal hartebeest (Alcelaphus busephalus buselaphus)
, along with large predators like the African wild dog (Lycaon pictus)
, the Northwest African cheetah (Acinonyx jubatus hecki)
, the Northeast African cheetah (Acinonyx jubatus soemmeringii)
, the 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, cheetah, lion and red-fronted gazelle), endangered
(Dama gazelle and African wild dog), or extinct
(the Scimitar-horned oryx is probably extinct in the wild
, and both Pelorovis
and the Bubal hartebeest are now extinct).
The Sahel mainly receives a low to very low amount of precipitation annually. The steppe has a very long, prevailing dry season and a short rainy season. The precipitation is also extremely irregular, and varies considerably from season to season. Most of the rain usually falls during four to six months in the middle of the year, while the other months may remain absolutely dry. The interior of the Sahel region generally receives between 200 mm and 700 mm of rain yearly. A system of subdivisions often adopted for the Sahelian climate based on annual rainfall is as follows: the Saharan-Sahelian climate, with mean annual precipitation between around 100 and 200 mm (such as Khartoum
, Sudan), the strict Sahelian climate, with mean annual precipitation between around 200 and 700 mm (such as Niamey
, Niger) and the Sahelian-Sudanese climate, with mean annual precipitation between around 700 and 1,200 mm (such as Bamako
, Mali). The relative humidity
in the steppe is low to very low, often between 10% and 25% during the dry season and between 25% and 75% during the rainy season. The least humid places have a relative humidity under 35%.
The Sahel is characterized by constant, intense heat, with an unvarying temperature. The Sahel rarely experiences cold temperatures. During the hottest period, the average high temperatures are generally between 36 and 42 °C (97 and 108 °F) (and even more in the hottest regions), often for more than three months, while the average low temperatures are around 25 to 31 °C (77 to 88 °F). During the "coldest period", the average high temperatures are between 27 and 33 °C (81 and 91 °F) and the average low temperatures are between 15 and 21 °C (59 and 70 °F). Everywhere in the Sahel, the average mean temperature is over 18 °C (64 °F).
The Sahel has a high to very high sunshine duration
year-round, between 2,400 hours (about 55% of the daylight hours) and 3,600 hours (more than 80% of the daylight hours). The sunshine duration in the Sahel approaches desert levels, and is comparable to that in the Arabian Desert
, for example, even though the Sahel is only a steppe and not a desert. The cloud cover
is low to very low. For example, Niamey
, Niger has 3,082 hours of bright sunshine; Gao
, Mali has near 3,385 hours of sunshine; Timbuktu
, Mali has 3,409 sunny hours, and N'Djamena
, Chad has 3,205 hours of sunlight.
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 with more vegetation, is utilized by having the herds graze on high-quality feed in the North during the wet season, and trek several hundred kilometers to the South to graze on more abundant, but less nutritious feed during the dry period.
Around 4000 BC, 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 caused migrations of farming communities to the more humid climate of West Africa
1905 depiction of ethnic groups in the Sahel
The Sahelian kingdoms were a series of monarchies centered in the Sahel between the 9th and 18th centuries. The wealth of the states came from controlling the trans-Saharan trade
routes across the desert, especially with the Islamic world. 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 quite decentralized with member cities having a great deal of autonomy. The first large Sahelian kingdoms emerged after AD 750 and supported several large trading cities in the Niger Bend
region, including Timbuktu
The Sahel states were hindered from expanding south into the forest zone of the north Akan state of Bonoman
peoples 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.
For hundreds of years, the Sahel region has experienced regular droughts and megadroughts
. One megadrought lasted from 1450 to 1700, 250 years.
There was a major drought in the Sahel in 1914 caused by annual rains far below average, leading to large-scale famine. From 1951 to 2004, the Sahel experienced some of the most consistent and severe droughts in Africa.
The 1960s 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. When the long drought period from 1968 through 1974 began, 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 somewhat tempered by international visibility and an outpouring of aid. This catastrophe led to the founding of the International Fund for Agricultural Development
Between June and August 2010, famine struck the Sahel.
Niger's crops failed to mature in the heat, 350,000 faced starvation, and 1,200,000 were at risk of famine.
In Chad the temperature reached 47.6 °C (117.7 °F) on 22 June in Faya-Largeau
, breaking a record set in 1961 at the same location. Niger tied its highest temperature record set in 1998, also on 22 June, at 47.1 °C in Bilma
. That record was broken the next day, when Bilma hit 48.2 °C (118.8 °F). The hottest temperature recorded in Sudan was reached on 25 June, at 49.6 °C (121.3 °F) in Dongola
, breaking a record set in 1987.
Niger reported on 14 July that diarrhoea
, starvation, gastroenteritis
and respiratory diseases
had sickened or killed many children. The new military junta
appealed for international food aid and took serious steps to call on overseas help.
On 26 July, the heat reached near-record levels over Chad
and in northern Niger about 20 people reportedly died of dehydration by 27 July.
Desertification and soil loss
The Sahel region faces environmental issues that are contributing to global warming
. If the change in climate in the Sahel region "is not slowed-down and desertification possibly reversed through sustainable practices and any form of reforestation
, it is only a matter of time before" countries like Niger lose their entire landmass to desert due to unchecked unsustainable human practises.:9
Over-farming, over-grazing, over-population
of marginal lands, and natural soil erosion
, have caused serious desertification
of the region.
This has affected shelter construction, making it necessary to change the used materials. The Woodless Construction project was introduced in Sahel in 1980 by the Development Workshop, achieving since then a high social impact in the region.
A major initiative to combat desertification in the Sahel region via reforestation and other interventions is the Great Green Wall
Major dust storms
are a frequent occurrence as well. During November 2004, a number of major dust storms hit Chad
, originating in the Bodélé Depression
This is a common area for dust storms, occurring on average on 100 days every year.
Instability and violence
Terrorist organizations including Boko Haram
and Al-Qaeda in the Islamic Maghreb
(AQIM) operating in the Sahel have contributed to the violence, extremism and instability of the region.
In March 2020, the United States sent a special envoy for the Sahel region to combat the rising violence from terrorist groups.
Envoy Peter Pham, started his new role on 1 March 2020.
He has been the U.S. Special Envoy for the Great Lakes Region of Africa since November 2018.
On 9 July 2020, the United States
raised concerns over growing number of allegations of human rights violations and abuses by state security forces in Sahel.
The US response came after Human Rights Watch
released documents regarding the same on 1 July.
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- ^ A System of Modern Geography. E. Huntington & Co. 1834. pp. 287. sahara ocean of sand.
- ^ "Sahel dictionary definition - Sahel defined". www.yourdictionary.com. Retrieved August 30, 2020.
- ^ Marcel, Jean Jacques (1837). Vocabulaire Français-Arabe des dialectes vulgaires Africains; D'Alger, de Tunis, de Marok et d'Égypte (in Arabic). Hingray.
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