7.1 Introducing the Realm

Physical Geography of Subsaharan Africa

The African Transition Zone divides North Africa from the rest of Africa because of climatic and cultural dynamics. Cultural conflicts and desertification are common in the zone. Dry, arid type B climates, common in the Sahara Desert, are dominant north of the zone. Tropical type A climates prevail south of the zone. Global climate changes continue to shape the continent. The shifting sands of the Sahara are slowly moving southward toward the tropics. Desertification in the zone continues as natural conditions and human activity place pressure on the region through overgrazing and the lack of precipitation. Type B climates resurface again south of the tropics in the southern latitudes. The Kalahari and Namib Deserts are located in Southern Africa, mainly in the countries of Botswana and Namibia.

For a continent as large as Africa, Subsaharan Africa does not have extended mountain ranges comparable to the ranges in North or South America, Europe, Asia, or Antarctica. There are, however, on the Ethiopian Highlands the Ethiopian Plateau that reach as high as 15,000 feet in elevation. East Africa has a number of well-known volcanic peaks that are high in elevation. The tallest point in Africa—Mt. Kilimanjaro in Tanzania near the border with Kenya—is 19,340 feet high. Nearby in Kenya, Mt. Kenya is 17,058 feet high. The Rwenzori Mountains on The Congo/Uganda border reach more than 16,000 feet in elevation and create a rain shadow effect for the region. Permanent glaciers exist on these ranges even though they are near the equator. On the western side of the continent, Mt. Cameroon in Central Africa is more than 13,000 feet in elevation. The South Africa’s Cape Ranges are low-lying mountains no higher than about 6,000 feet. The continent of Africa consists of basins and plateaus without long mountain chains. The plateaus can range more than 1,000–2,500 feet in elevation. The only continuous feature is the eastern rift valleys that run along the tectonic plate boundaries from the Red Sea through to South Africa.

The main rivers of Africa include the Nile, Niger, Congo, and Zambezi. The Nile River competes with the Amazon for the status as the longest river in the world; the White Nile branch begins in Lake Victoria in East Africa, and the Blue Nile branch starts in Lake Tana in Ethiopia. The Niger flows through West Africa; its mouth is in Nigeria. The Congo River crosses the equator with a large tropical drainage basin that creates a flow of water second only to the Amazon in volume. The Zambezi River in the south is famous for the extensive Victoria Falls on the Zambia and Zimbabwe border. Victoria Falls is considered the largest waterfall in the world. Other significant rivers exist such as the Orange River, which makes up part of the border between South Africa and Namibia.

There are a number of large lakes in Subsaharan Africa. The largest is Lake Victoria, which borders several East African countries and is considered to be the second-largest lake in the world in surface area. Only Lake Superior in North America has a greater surface area. A number of large lakes are located in the rift valleys of the east. Three of the largest lakes along the western rift are Lake Malawi, Lake Tanganyika, and Lake Albert. To the northeast of these in Kenya is Lake Turkana, which reaches to the Ethiopian border. Lake Chad is located in the African Transition Zone on the border between Chad, Mali, and Nigeria. Lake Chad has been severely reduced in size in recent years.

The equator runs through the center of Subsaharan Africa, providing tropical type A climates. These regions usually have more rainfall, resulting in lighter, leached-out soils that may not be as productive as regions with richer volcanic soils, such as those found in the rift valleys. Root crops are common in Africa, as are millet and corn (maize). The savanna regions of the east and south have seasonal rains that affect the growing season. Soils in savanna areas are usually not as productive and cannot be depended on to fulfill the agricultural needs of growing populations. Savannas are usually grasslands or scrub forests with a seasonal precipitation pattern. Cattle and livestock grazing are common in savannas, and migrations are frequent to follow seasonal grazing conditions. In specific areas of Southern Africa, larger farming operations exist in type C climates. However, Subsaharan Africa is not blessed with the large regions of rich alluvial soils found in the Northern Hemisphere. The ever-growing agrarian population has always depended on the land for food and sustenance, but these conditions are not favorable for Africa’s future. Populations are growing faster than any increase in agricultural production.

Increasing populations in Subsaharan Africa are taxing the natural environment. Where the carrying capacity has been exceeded, the natural capital is being depleted at an unsustainable rate. Deforestation is occurring in areas where firewood is in high demand, and trees are cut down faster than they can grow back. Expanding human populations are also encroaching on the natural biodiversity for which the African continent is renowned. Large game animals such as rhinoceroses, elephants, and lions have been hunted or poached with devastating consequences. The creation of game preserves and national parks has stemmed this tide, but poaching remains a serious problem even in these protected areas. Gorilla and chimpanzee populations have also been stressed by human population growth. These animals are being killed by humans for bush meat, and their habitats are being reduced by human activities.

Kingdoms, Empires, and the Slave Trade

West Africa was home to a number of large empires that shaped the culture and people of present-day Africa. Gold, salt, copper, and ivory were important early trading commodities. Mining and acquiring these items brought enormous wealth to the region. Slavery became a component in the warfare between groups, as the winner usually took the captives to serve as servants or slaves. The Ghana Empire (790–1076 CE) was responsible for one of the early consolidations of power in West Africa. Though its power and wealth were vast, it was only the first of a number of empires to arise in the region.

After the Ghana Empire came the Mali Empire (1230–1600 CE), which was known for its wealth and size. The empire held major mining operations including gold, copper, and salt. Expanding along the Niger River and to the Atlantic coast, the Mali Empire extended over an area the size of Western Europe. Originally a federation of local groups, the empire incorporated many smaller provinces or kingdoms and had a major influence on the region’s laws and cultural heritage.

One of the indigenous states that evolved out of the Mali Empire was that of the Songhai people, who were located to the east of the main Mali Empire. The Songhai had been based around the city of Gao for centuries, and in fifteenth century, they established the Songhai Empire, one of the largest empires in African history. The city of Timbuktu became prominent during this period as an urban center, and its educational institutions became well known. In the end, the Songhai Empire was defeated by Moroccan Berber forces that splintered the empire into many smaller kingdoms and ethnic clans.

South of the empires of the Niger River were coastal kingdoms, including the Ashanti and the Dahomey, which flourished during the colonial era. The local African groups had to contend with the colonial European traders and invaders, which had superior weapons and different technology. Besides the mining resources of gold copper, salt, and ivory, the slave trade was a driving force that attracted trade ships from various European countries.

The Ashanti Empire was located along the Atlantic coast in an inland region of what is now Ghana and Ivory Coast; this area served as a trading corridor where goods from the northern regions crossed to make their way to the coastal trading towns. The Ashanti Empire took advantage of the trade opportunities and became wealthy. By the time the Europeans arrived, Ashanti trade relationships were well established and capable of supplying the colonial ships with slaves, ivory, and gold. The coastal area of Ghana was known as the Gold Coast during colonial times. Similarly, the country of Ivory Coast (Côte d’Ivoire) got its name from its participation in the elephant ivory trade. The Ashanti were known for their involvement in the slave trade and today must live with that legacy.

This region of West Africa bordering the Atlantic was called the Slave Coast because of the high number of local people from this area who were sold into the European slave trade and shipped to the Americas. The once powerful Kingdom of Dahomey, east of the Ashanti Empire, was heavily involved in the slave trade. Slave trading with Europeans brought them rifles and other firearms that were useful in conflicts with their regional adversaries. A major slave state along the Slave Coast, the kingdom attracted the spite of its neighbors as a pariah state for selling its war captives into transatlantic slavery rather than killing them, as was the custom in warfare. The Kingdom of Dahomey became the country of Benin after the colonial era.

The slave trade brought wealth to many of the slave-trading kingdoms on the African coast. The demand for slaves pushed many of the African kingdoms to expand their slave-trading activities, capturing more individuals whom they could sell to European slave traders. Millions of Africans were captured by other Africans only to be sold into slavery, placed on ships, and sent to slave owners in the Americas. The total number sold into the Atlantic slave trade will never be known, but estimates range somewhere between ten and twelve million.