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52-524: The Ouadi Rimé–Ouadi Achim, covering three habitats of Sahelian wooded grassland, sub-desert grassland (covers about 66% of the area), and desert, and is one of the largest reserves in Chad. Its terrain, with an elevation range of 180–250 m (590–820 ft), has no prominent features except for an isolated patch of a remnant of volcanic eruption . It has a long line of dunes called the Goz Kerky that runs through

104-458: A tropical savanna climate or a humid subtropical climate . These climates tend to have hot, or sometimes extremely hot, summers and warm to cool winters, with some to minimal precipitation. Hot semi-arid climates are most commonly found around the fringes of subtropical deserts. Hot semi-arid climates are most commonly found in Africa , Australia , and South Asia . In Australia, a large portion of

156-561: A great deal of autonomy. The larger Sahelian kingdoms emerged from 750 AD and erected several large cities in the Niger valley region, including Timbuktu , Gao and Djenné . 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,

208-434: A location has a semi-arid climate, the precipitation threshold must first be determined. The method used to find the precipitation threshold (in millimeters): If the area's annual precipitation in millimeters is less than the threshold but more than half or 50% the threshold, it is classified as a BS (steppe, semi-desert, or semi-arid climate). Furthermore, to delineate hot semi-arid climates from cold semi-arid climates,

260-409: A mean annual temperature of 18 °C (64.4 °F) is used as an isotherm. A location with a BS -type climate is classified as hot semi-arid ( BSh ) if its mean temperature is above this isotherm, and cold semi-arid ( BSk ) if not. Hot semi-arid climates (type "BSh") tend to be located from the high teens to mid-30s latitudes of the tropics and subtropics , typically in proximity to regions with

312-448: 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

364-614: 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

416-552: 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. In Western Sahel, polygamy and child marriage are common. Female genital mutilation

468-762: A warmer Atlantic Ocean. Warming of the Mediterranean Sea may also be a factor. Protected areas in the Sahel include Ferlo Nord Wildlife Reserve in Senegal, Sylvo-Pastoral and Partial Faunal Reserve of the Sahel in Burkina Faso, Ansonga-Ménake Faunal Reserve in Mali, Tadres Reserve in Niger, and Waza National Park in Cameroon. Traditionally, most of the people in the Sahel have been semi- nomads , farming and raising livestock in

520-608: Is a common area for dust storms, occurring on average on 100 days every year. On 23 March 2010, a major sandstorm hit Mauritania, Senegal, The Gambia , Guinea-Bissau , Guinea , and inland Sierra Leone . Another struck in southern Algeria , inland Mauritania, Mali and northern Ivory Coast at the same time. Following the drought period of the 1970s and 1980, however, the Sahel began to experience increased rainfall. This may be due to global warming , which can cause changes that may result in changes in large-scale weather patterns, such as increased stronger monsoons, in turn caused by

572-534: Is also called the Sahelian Acacia savanna in honour of its most prominent and very drought tolerant genus of tree. 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

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624-513: Is also practiced across the Sahel. The term "Sahel" is borrowed from the Arabic name for the region, الساحل al-sāḥil . Sāḥil literally means "coast, shore", which has been explained as a figurative reference to the southern edge of the vast Sahara. However, such use is unattested in Classical Arabic , and it has been suggested that the word may originally have been derived from

676-759: Is located on regions that receive precipitation below potential evapotranspiration , but not as low as a desert climate . There are different kinds of semi-arid climates, depending on variables such as temperature, and they give rise to different biomes . A more precise definition is given by the Köppen climate classification , which treats steppe climates ( BSh and BSk ) as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential. Semi-arid climates tend to support short, thorny or scrubby vegetation and are usually dominated by either grasses or shrubs as they usually cannot support forests. To determine if

728-413: Is only a matter of time before countries like Niger lose their entire landmass to desert due to unchecked unsustainable human practices. 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

780-574: Is probably extinct in the wild , and both Pelorovis and the Bubal hartebeest are now extinct). The seasonal wetlands of the Sahel are important for migratory birds moving within Africa and on the African-Eurasian flyways . The Sahel has a tropical semi-arid climate ( Köppen climate classification BSh ). The climate is typically hot, sunny, dry and somewhat windy all year long. The Sahel's climate

832-457: 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

884-605: Is the transition zone between the more humid Sudanian savannas to its south and the drier Sahara to the north. The Sahel has a hot semi-arid climate and stretches across the southernmost latitudes of North Africa between the Atlantic Ocean and the Red Sea . Although geographically located in the tropics, the Sahel does not have a tropical climate . Especially in the western Sahel, there are frequent shortages of food and water due to its very high government corruption and

936-424: Is widely prevalent. Falconers from Persian Gulf states, who used to visit the reserve to hunt bustards and gazelles , have been prevented from doing so because of local resistance. Sahel The Sahel region ( / s ə ˈ h ɛ l / ; from Arabic ساحل ( sāḥil [ˈsaːħil] )  'coast, shore'), or Sahelian acacia savanna , is a biogeographical region in Africa . It

988-724: The ABC Islands , the rain shadows of Hispaniola 's mountain ranges in the Dominican Republic and Haiti , parts of the Southwestern United States including California's Central Valley , and sections of South America such as the sertão , the Gran Chaco , and the poleward side of the arid deserts, where they typically feature a Mediterranean precipitation pattern, with generally rainless summers and wetter winters. They are also found in few areas of Europe surrounding

1040-608: The G5 Sahel , an anti-terrorism alliance, after the military regimes in Burkina Faso, Niger, and Mali withdrew. 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. Reports in March 2022 show militants are expanding and spreading out south of

1092-518: The Mali War . 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 was intensified by a 1.2°C global temperature increase from human activities. Semi-arid climate#Hot semi-arid climates A semi-arid climate , semi-desert climate , or steppe climate is a dry climate sub-type. It

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1144-586: The Mediterranean Basin . In Europe, BSh climates are predominantly found in southeastern Spain . It can also be found primarily in parts of south Greece but also in marginal areas of Thessaloniki and Chalkidiki in north Greece , most of Formentera , marginal areas of Ibiza and marginal areas of Italy in Sicily , Sardinia and Lampedusa . Cold semi-arid climates (type "BSk") tend to be located in elevated portions of temperate zones generally from

1196-518: The Outback surrounding the central desert regions lies within the hot semi-arid climate region. In South Asia, both India and parts of Pakistan experience the seasonal effects of monsoons and feature short but well-defined wet seasons , but are not sufficiently wet overall to qualify as either a tropical savanna or a humid subtropical climate. Hot semi-arid climates can be also found in parts of North America , such as most of northern Mexico ,

1248-417: 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). Representing a climatic and ecological transition zone with hot semi-desert and steppe conditions , the Sahel region borders the more humid Sudanian savannas to its south and the dry Sahara desert to the north. This ecoregion

1300-400: The semi-arid climate . This is exacerbated by very high birthrates across the region, resulting in a rapid increase in population. In recent times, various coups , insurgencies , terrorism and foreign interventions have taken place in many Sahel countries, especially across former Françafrique . The Sahel spans 5,900 km (3,670 mi) from the Atlantic Ocean in the west to

1352-429: 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

1404-558: The Arabic word سهل sahl "plain" instead. 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 . The Sahelian kingdoms were

1456-410: The Sahel region has experienced frequent 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

1508-468: The Sahel. The area has also seen a high prevalence of coups d'état , with military juntas currently ruling in Mali, Burkina Faso, Niger, Chad, and Sudan. The violent herder–farmer conflicts in Nigeria , Mali , Sudan and other countries in the Sahel region have been exacerbated by climate change , land degradation , and rapid population growth . Droughts and food shortages have been also linked to

1560-401: The Sahelian wooded grassland recording a mean annual rainfall in the range of 105–980 millimetres (4.1–38.6 in), the sub-desert grassland zone recording rainfall in the range of 43–570 mm (2–22 in) and the desert with scanty rainfall in the range of 0–73 mm (0–3 in). Senegalia senegal , Balanites aegyptiaca , Combretum glutinosum and Boscia senegalensis are

1612-527: 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. For hundreds of years,

Ouadi Rimé-Ouadi Achim Faunal Reserve - Misplaced Pages Continue

1664-625: The dominant trees, with Acacia tortilis the most common, along with Senegalia senegal and Senegalia laeta . Other tree species include Adansonia digitata , Commiphora africana , Balanites aegyptiaca , Faidherbia albida , Borassus aethiopum , Vitellaria paradoxa , Olea europaea , Arbutus unedo , Phoenix canariensis , Hyphaene compressa , Cupressus sempervirens , Quercus coccifera , Quercus suber , Pinus nigra , Populus nigra , Ceratonia siliqua , Salix alba , Afzelia africana , Kigelia africana , Sclerocarya birrea , and Boscia senegalensis . In

1716-653: 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

1768-860: The giant prehistoric buffalo ( Pelorovis ) , and Bubal hartebeest (Alcelaphus buselaphus buselaphus) , along with large predators, such as the African wild dog (Lycaon pictus) , the Northwest African cheetah (Acinonyx jubatus hecki) , the Northeast African cheetah (Acinonyx jubatus soemmeringii) , and 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

1820-399: The heat reached near-record levels over Chad and Niger, and in northern Niger about 20 people reportedly died of dehydration by 27 July. 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

1872-520: The horses and camels were susceptible to the humidity and diseases of the tropics. The Western Sahel fell to France in the late 19th century as part of French West Africa . Chad was added in 1900 as part of French Equatorial Africa . The French territories in the Sahel were decolonized in 1960. The Sahel's easternmost region did not fall to the European powers but to the Khedivate of Egypt when it

1924-525: The mid-30s to low 50s latitudes, typically bordering a humid continental climate or a Mediterranean climate . They are also typically found in continental interiors some distance from large bodies of water. Cold semi-arid climates usually feature warm to hot dry summers, though their summers are typically not quite as hot as those of hot semi-arid climates. Unlike hot semi-arid climates, areas with cold semi-arid climates tend to have cold and possibly freezing winters. These areas usually see some snowfall during

1976-465: 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),

2028-433: 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

2080-500: The northern part of the Sahel, areas of desert shrub, including Panicum turgidum and Aristida sieberiana , 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) ,

2132-492: The plant types in the Sahelian grassland. Plant species Aristida mutabilis , Chloris prieurii and Cenchrus biflorus , herbs Limeum viscosum , Indigofera hochstetteri and Blepharis linariifolia are recorded in the desert zone; the dune depressions have Vachellia tortilis . Also noted are clumps of Cornulaca monacantha in the deserts. Faunal species noted are dama gazelle , Dorcas gazelle , red-fronted gazelle , Northeast African cheetah and addax , but

Ouadi Rimé-Ouadi Achim Faunal Reserve - Misplaced Pages Continue

2184-520: The presence of the last two is in doubt. The scimitar oryx had its last stronghold in this reserve before eventually becoming extinct in the wild . Subsequently, a reintroduction program for the species selected Ouadi Rimé-Ouadi Achim to reintroduce it in the wild; as a result, since 2016, a small herd is living within the reserve limits. Some 267 bird species, including three species of the Sudan–Guinea Savanna biome, have been recorded. During

2236-461: The rainy season migrant Palearctic waterbirds flock to the streams in large numbers. The reserve has been designated an Important Bird Area (IBA) by BirdLife International . Though created primarily to protect the fauna in the reserve there are hardly any personnel posted for the purpose. The problem of water shortage due to the reduced incidence of rainfall has been answered by the provision of deep tube wells as water sources. However, hunting

2288-421: The reserve in a north–south direction. The eastern part of the reserve has massifs which rise to a height of 1,500 m (4,900 ft) which drain a number of streams that flow through the reserve. The reserve also has flood plains which are inundated temporarily and along with the streams help in creation of the biodiversity of the reserve. Rainfall in the reserve mostly during July–September varies widely with

2340-503: 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

2392-495: 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. 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

2444-694: 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. 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. As of 2024, a wave of new military juntas in Africa, favoring Russian mercenaries over Western forces and UN peacekeepers, has intensified violence. This led Mauritania and Chad to disband

2496-796: The winter, though snowfall is much lower than at locations at similar latitudes with more humid climates. Areas featuring cold semi-arid climates tend to have higher elevations than areas with hot semi-arid climates, and tend to feature major temperature swings between day and night, sometimes by as much as 20 °C (36 °F) or more. These large diurnal temperature variations are seldom seen in hot semi-arid climates. Cold semi-arid climates at higher latitudes tend to have dry winters and wetter summers, while cold semi-arid climates at lower latitudes tend to have precipitation patterns more akin to Mediterranean climates , with dry summers, relatively wet winters, and even wetter springs and autumns. Cold semi-arid climates are most commonly found in central Asia and

2548-548: The world's fastest-growing terrorist organization. In 2023, fatalities from conflict in the central Sahel rose by 38%, according to data from the research organization Armed Conflict Location and Event Data Project. In the wake of the Libyan Crisis beginning in 2011, terrorist organizations operating in the Sahel, including Boko Haram , Islamic State and al-Qaeda in the Islamic Maghreb (AQIM), have greatly exacerbated

2600-407: Was conquered by Muhammad Ali in the 1820s. By 1899 it came under British rule until granted independence at Egypt's behest in 1956. 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

2652-588: 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 , 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. On 26 July,

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2704-599: 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

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