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, region of the western African continent comprising the countries of Benin, Burkina Faso, Cameroon, Cabo Verde, Chad, Côte d’Ivoire, Equatorial Guinea, The Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, and Togo. Western Africa is a term used in the Encyclopædia Britannica to designate a geographic region within the continent of Africa. The term West Africa is also often used to refer to this part of the continent. As conventionally understood, however, West Africa is primarily a political and economic designation and comprises all the areas considered here except Cameroon, Chad, Equatorial Guinea, and the Saharan parts of Mali, Mauritania, and Niger.
The region may be divided into several broad physiographic regions. The northern portion of western Africa is composed of a broad band of semiarid terrain, called the western Sudan, stretching from the Atlantic Ocean on the west to the area of Lake Chad on the east, a distance of about 2,500 miles (4,000 km). It is largely a plateau of modest elevation and borders the Sahara (desert) on the north and the Guinea Coast forests on the south. Rainfall in this region ranges from less than 10 inches (250 mm) in its arid northern reaches to about 50 inches (1,250 mm) in the south. The flora of the western Sudan consists of the scrub vegetation of the transitional zone known as the Sahel in the north and a mix of tall trees and high savanna grasslands in the south. Lying south of the western Sudan are the Guinea Coast equatorial forests, which flourish along the Atlantic coast and extend inland for about 100 to 150 miles (160 to 240 km).
Most of the Sahara and the transitional vegetational zones to its south (the Sahel and the western Sudan) are drained, where there is enough rainfall to support surface streams, either southward via the Niger River system or inland to the Lake Chad basin in the east. Along the better-watered Atlantic coastal areas, the chief features are (west to east) the Mauritanian-Senegal Basin, drained by the Sénégal River; the Fouta Djallon and Guinea Highlands; the Volta River and Niger River coastal plains; and the uplands of Nigeria’s Jos Plateau and the Cameroon Highlands.
Culturally, the people of the region belong for the most part to one of three major language families. In the northern and least-populous Saharan regions, Arabs and Imazighen (Berbers; singular Amazigh) of the Afro-Asiatic language family predominate. South of a line connecting the course of the Sénégal River, the Niger River, and the southern two-thirds of Nigeria, Niger-Congo languages are spoken. Along the middle course of the Niger River and around Lake Chad, Nilo-Saharan languages related to those of peoples farther east predominate. These peoples are divided into a very complex ethnic mosaic but may often be conveniently classified by their individual languages.
This article covers the history of the region primarily from the 11th century through the 20th century. Coverage of the region’s physical and human geography can be found in the article Africa. For discussion of the physical and human geography of individual countries in the region and of their postcolonial history, see Benin, Burkina Faso, Cameroon, Cape Verde, Chad, Côte d’Ivoire, Equatorial Guinea, The Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, and Togo. Area 3,059,702 square miles (7,924,592 square km). Pop. (2014 est.) 375,477,000.