Geography of West Africa

Geography of West Africa
Hogweard · Public domain · source
Name	West Africa (geographical region)
Caption	Political map of West Africa showing ECOWAS member states and major cities
Region	Africa
Area km2	5410000
Population	400000000+
Countries	Nigeria, Ghana, Senegal, Mali, Burkina Faso, Niger, Ivory Coast, Guinea, Guinea-Bissau, The Gambia, Sierra Leone, Liberia, Benin, Togo, Mauritania, Cape Verde

Contents

Geography of West Africa West Africa occupies the westernmost portion of the African continent, spanning from the Sahara Desert margins to the Atlantic Ocean and including continental and island states such as Cape Verde and Mauritania. The region's physical structure, climate gradients, river basins, and resource distributions shaped historical polities like the Mali Empire, Songhai Empire, Ashanti Empire, and modern organizations such as the Economic Community of West African States and the African Union. Major urban centers including Lagos, Abidjan, Accra, Dakar, and Bamako reflect coastal and inland contrasts that link to trans-Saharan trade routes like those used in the Trans-Saharan trade and colonial-era infrastructure projects by France and United Kingdom.

Physical geography

West Africa's physiography includes components of the West African Craton, the coastal Guinean coastal plain, the Fouta Djallon highlands, the Sahelian belt, and the northern Sahara Desert fringe near Timbuktu and Agadez. Islands such as Sao Tome and Principe lie off the Gulf of Guinea while archipelagos like Cape Verde occupy Atlantic volcanic terrain influenced by the Canary Current and North Atlantic Gyre. Mountainous areas include the Tibesti Mountains margins and the Mount Nimba range on the Guinea–Ivory Coast–Liberia border, intersecting ecoregions like the Guinean Forests of West Africa. Coastal features include the Gulf of Guinea, the Senegal River estuary, the Gambia River delta, and extensive mangrove systems near Sapele-adjacent creeks and the Niger Delta estuary. Plateaus such as the Jos Plateau and the Adamaoua Plateau transition to plains that hosted historic sites like Bobo-Dioulasso and Kano along trans-Saharan caravan routes.

West Africa's climate ranges from hyper-arid Sahara Desert conditions in northern Mauritania and Niger to humid tropical monsoon climates on the coasts of Sierra Leone, Liberia, and Côte d'Ivoire where ecosystems include Upper Guinean forests. The Intertropical Convergence Zone's seasonal migration drives wet and dry seasons affecting locations such as Dakar, Accra, and Lagos, while the Harmattan trade wind from the northeast influences dust transport to cities like Bamako and Ouagadougou. Biomes include Sahelian savanna grasslands, Sudanian savanna, coastal mangroves around Abidjan and Conakry, and montane forests in the Guinea Highlands and Mount Nimba that host endemic species recorded in inventories by institutions like the IUCN and programs such as the Convention on Biological Diversity.

The region's hydrology centers on major basins: the Niger River flowing through Guinea, Mali, Niger, and Nigeria to the Gulf of Guinea; the Senegal River draining Guinea, Mali, Mauritania, and Senegal; and the Gambia River traversing Guinea and The Gambia before reaching the Atlantic. The Volta River system in Ghana and Burkina Faso includes reservoirs such as Akosombo Dam on Lake Volta, one of the world's largest artificial lakes. The Niger Delta in Nigeria contains deltaic complexes and wetlands impacted by oil extraction by companies like Shell and ExxonMobil. Seasonal flood regimes influence inland fisheries around Bamako and riverine agriculture near cities like Kano and Niamey; transboundary water management involves treaties and bodies including the Niger Basin Authority and the Senegal River Basin Development Organization.

Soil diversity spans aridisols and entisols of the Sahara Desert to ferralsols and nitisols in the Guinean Forests of West Africa supporting crops in regions like Côte d'Ivoire and Ghana. Savannah soils underlie pastoral zones in Mali, Burkina Faso, and Niger where millet, sorghum, and cattle production have long histories tied to groups such as the Tuareg and Fulani. Coastal plantations in Sierra Leone, Liberia, and Nigeria were established during colonial commodity booms for palm oil, cocoa, and coffee and are associated with estates run by firms rooted in British Empire and French colonial empire trade networks. Vegetation gradients from mangrove forests at Bissau and Monrovia to gallery forests along the Niger River corridor sustain biodiversity hotspots cataloged by museums like the Natural History Museum, London and research centers such as the International Institute of Tropical Agriculture.

West Africa hosts significant mineral and energy resources: petroleum basins in Nigeria, Ghana, and Côte d'Ivoire; gold deposits in Mali (e.g., Sadiola Gold Mine), Ghana (e.g., Obuasi mine), and Burkina Faso; bauxite in Guinea (notably deposits near Boké); iron ore at Simandou (Guinea); and diamonds in Sierra Leone and Liberia. Agricultural land use includes cocoa plantations in Ivory Coast and Ghana, cotton in Mali and Burkina Faso, and rice systems in the Inner Niger Delta and Gambia River floodplain. Urban expansion around Lagos and Abidjan competes with peri-urban agriculture and artisanal mining (galamsey) in regions like Ashanti Region, affecting tenure arrangements mediated by customary authorities such as the Ooni of Ife and statutory regimes inherited from French West Africa and British West Africa.

West Africa faces desertification across the Sahel exacerbated by droughts recorded in the 1970s–1980s that affected administrations like Nigerien and Malian governments and spurred initiatives by agencies such as the UNEP and the World Bank. Deforestation in the Upper Guinean forests threatens endemic fauna including species assessed by the IUCN Red List and conservation programs run by organizations like WWF and Conservation International. Oil spills in the Niger Delta triggered litigation involving multinational firms and activists linked to cases heard in courts in The Hague and London. Transboundary protected areas such as the W-Arly-Pendjari Complex and reserves like Niokolo-Koba National Park in Senegal are focal points for regional conservation strategies enacted under frameworks like the Convention on Migratory Species and support from donors including the European Union and African Development Bank. Climate adaptation projects, reforestation efforts such as the Great Green Wall initiative, and community-based resource management with NGOs like Medicins Sans Frontieres and Norwegian Refugee Council intersect with security issues involving insurgencies in regions near Mali and Niger and humanitarian responses coordinated by UNICEF and UNHCR.

Category:Geography of Africa