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Cameroon, country lying at the junction of western and central Africa. Its ethnically diverse population is among the most urban in western Africa. The capital is Yaoundé, located in the south-centre of the country.
The country’s name is derived from Rio dos Camarões (“River of Prawns”)—the name given to the Wouri River estuary by Portuguese explorers of the 15th and 16th centuries. Camarões was also used to designate the river’s neighbouring mountains. Until the late 19th century, English usage confined the term “the Cameroons” to the mountains, while the estuary was called the Cameroons River or, locally, the Bay. In 1884 the Germans extended the word Kamerun to their entire protectorate, which largely corresponded to the present state.
Cameroon is triangular in shape and is bordered by Nigeria to the northwest, Chad to the northeast, the Central African Republic to the east, the Republic of the Congo to the southeast, Gabon and Equatorial Guinea to the south, and the Atlantic Ocean to the southwest.
Cameroon can be divided into northern, central, southern, and western geographic regions. North of the Benue (Bénoué) River, the savanna plain that occupies the country’s centre declines in elevation as it approaches the Lake Chad basin. The region contains scattered inselbergs, mounds of erosion-resistant rock that rise above the plains. The Gotel Mountains of the Adamawa Plateau trend from south to north, culminating in the Mandara Mountains of the northwest.
The central region extends east from the western highlands and from the Sanaga River north to the Benue River. The land rises progressively to the north and includes the Adamawa Plateau, with elevations between 2,450 and 4,450 feet (750 and 1,350 metres).
The southern region extends from the Sanaga River to the southern border and from the coast eastward to the Central African Republic and the Republic of the Congo. It consists of coastal plains that are about 25 miles (40 km) wide and a densely forested plateau with an average elevation of a little more than 2,000 feet (600 metres).
The western region extends north and west from the Sanaga River and continues north along the Nigerian border as far as the Benue River. The relief is mostly mountainous, the result of a volcanic rift that extends northward from the island of Bioko. Near the coast, the active volcanic Mount Cameroon rises to the highest elevation in western Africa—13,435 feet (4,095 metres).
The rivers of Cameroon form four large drainage systems. In the south the Sanaga, Wouri, Nyong, and Ntem rivers drain into the Atlantic Ocean. The Benue River and its tributary, the Kébi, flow into the Niger River basin of Nigeria. The Logone and Chari rivers—which form part of the eastern border with Chad—drain into Lake Chad, whereas the Dja River joins the Sangha River and flows into the Congo River basin.
The soils of Cameroon may be roughly divided into three groups. The first soil group, developed primarily in the higher-precipitation south and south-centre, is composed of soils with strong physical makeup but weaker chemical properties. With good depth, high permeability, and stable structure, these soils are less prone to erosion. They rely on the input of organic matter to replenish nutrient levels; interruption of this cycle leads to swift depletion and decrease in fertility.
The second soil group is present mainly in the lower-precipitation northern regions. Weathering by water is not as significant a problem for that soil group as mechanical weathering. A lower iron content dictates the soils’ colouring, which ranges from gray to brown. Though more fertile than their counterparts in the south, these soils are susceptible to nutrient imbalances that can impede productivity.
The third soil group is a general gathering of a number of young soils, including andosols, which are developed from volcanic ash and other matter, and the dark, clay-laden vertisols. Incidence of these soils varies by region.
Lying wholly within the tropics, the country is hot throughout the year; mean annual temperatures range between the low 70s and low 80s F (within the 20s C), although they are lower in areas of high elevation.
The incidence of precipitation depends largely on the seasonal movements of two contrasting air masses. The first is a dry continental tropical air mass, which originates over the Sahara and is associated with hot, dusty weather. The second is a warm and humid maritime tropical air mass that originates over the Atlantic and brings rain-bearing winds. Precipitation decreases from south to north. Along the coast, the rainy season lasts from April to November, and the relatively dry season lasts from December to March; a transition period from March to April is marked by violent winds. The mean annual precipitation level of more than 100 inches (2,500 mm) occurs in about 150 days. In the central plateau region, precipitation decreases to about 60 inches (1,500 mm). There are four seasons—a light rainy season from May to June, a short dry season from July to October, a heavy rainy season from October to November, and a long dry season from December to May. The north, however, has a dry season only from October to May and an average annual precipitation level of about 30 inches (750 mm). The wettest part of the country lies in the western highlands. Debundscha Point on Mount Cameroon has a mean annual precipitation level of more than 400 inches (10,000 mm)—an average rarely attained elsewhere in the world—most of which falls from May to October.
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