The lush green of the Sahelian acacia savanna during the rainy summer season in Mali. Note the large baobab amongst the acacia.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 several hundred to a thousand kilometers (c. 600 miles) wide. It covers an area of 3,053,200 square kilometers (1,178,850 sq mi).
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 (e.g. Marrah Mountains, Aïr Mountains, Ennedi Plateau), but are designated as separate ecoregions because their flora and fauna are distinct from the surrounding lowlands (e.g. East Saharan woodlands). 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.[2]
Ennedi Plateau is located at the border of the Sahara and the Sahel10 year average precipitation during the summer rainy season (May - September) in the Sahel and adjacent regions
The Sahel has a tropicalsemi-arid climate (Köppen climate classificationBSh). The climate is typically hot, sunny, dry and somewhat windy all year long. The Sahel's climate is similar to, but less extreme than, the climate of the Sahara desert located just to the north.
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 900 mm (such as Ouagadougou, Burkina Faso). 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%.[citation needed]
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).[3] 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.[4][5][6][7]
Traditionally, most of the people in the Sahel have been semi-nomads, farming and raising livestock in a system of transhumance. 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.[citation needed]
The term "Sahel" is borrowed from the Arabic name for the region, الساحلal-sāḥil. Sāḥil literally means "coast, shore",[10] which has been explained as a figurative reference to the southern edge of the vast Sahara.[11][12] However, such use is unattested in Classical Arabic, and it has been suggested that the word may originally have been derived from the Arabic word سهلsahl "plain" instead.[13]
History
Early agriculture
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 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.[14]
The Sahelian kingdoms were a series of monarchies centered in the Sahel between the 9th and 18th centuries. The wealth of the states, like the legendary Mali Empire at the time of Mansa Musa, came from controlling the trans-Saharan trade routes across the desert, especially with the Maghreb. 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.[citation needed]
Due to the wooded areas to their south, the Sahelian states were hindered from expanding into the north Akan state of the Bonoman and Yoruba peoples, as mounted warriors were all but useless in the forests. In addition, the horses and camels were susceptible to the humidity and diseases of the tropics.[16]
For hundreds of years, the Sahel region has experienced frequent droughts and megadroughts. One megadrought lasted from 1450 to 1700, 250 years.[22] 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.[23] 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.[24] Niger's crops failed to mature in the heat, 350,000 faced starvation, and 1,200,000 were at risk of famine.[25] 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.[26] Niger reported on 14 July that diarrhoea, starvation, gastroenteritis, malnutrition 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.[27] On 26 July, the heat reached near-record levels over Chad and Niger,[28] and in northern Niger about 20 people reportedly died of dehydration by 27 July.[citation needed]
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 practices.[29]: 9 Over-farming, over-grazing, over-population of marginal lands, and natural soil erosion, have caused serious desertification of the region.[30][31] 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.[32] 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.[33] This is a common area for dust storms, occurring on average on 100 days every year.[34]
According to The Economist, in recent years the Sahel has become the epicenter of terrorist violence, contributing to 35% of all global deaths from terrorism by 2021, with Jama’at Nasr al-Islam wal Muslimin, an al-Qaeda-affiliated group, identified as the world's fastest-growing terrorist organization.[1]
In the wake of the Libyan Crisis beginning in 2011,[36] terrorist organizations operating in the Sahel, including Boko Haram, Islamic State and al-Qaeda in the Islamic Maghreb (AQIM), have greatly exacerbated the violence, extremism and instability of the region.[37][38] In March 2020, the United States sent a special envoy for the Sahel region to combat the rising violence from terrorist groups.[39]
The Catholic charity Aid to the Church in Need has highlighted the fact that the Sahel has become one of the most dangerous regions in the world for Christians.[40]
Human rights issues and political instability
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.[41] The US response came after Human Rights Watch released documents regarding the same on 1 July.[42] Reports in March 2022 show militants are expanding and spreading out south of the Sahel.[43]
The Sahel is experiencing more severe weather due to climate change, exemplified by the extreme heatwave of March-April 2024 in Burkina Faso and Mali. This event, intensified by a 1.2°C global temperature increase from human activities.[49]
Moseley, W.G. 2008. "Strengthening Livelihoods in Sahelian West Africa: The Geography of Development and Underdevelopment in a Peripheral Region." Geographische Rundschau International Edition, 4(4): 44–50. [1]
World Wildlife Fund, ed. (2001). "Sahelian Acacia savanna". WildWorld Ecoregion Profile. National Geographic Society. Archived from the original on 8 March 2010.
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