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Sudanian savanna

earth science Maturity 7-9 Next article →

The Sudanian savanna is a massive tropical savanna biome. It forms a wide belt across the African continent. This belt runs from the Atlantic Ocean in the west to the Ethiopian Highlands in the east. It sits in the center of the Afrotropical realm. The name "Sudan" refers to the lands located south of the Sahel. The Sahel is a drier grassland to the north. To the south, the land transitions into humid forest-savanna mosaics. These forests are closer to the equator. This region is a vital part of Africa's natural landscape.

Geographically, the region is mostly a large plateau. It is shaped by several major river valleys. These include the White Nile, the Chad, and the Niger rivers. The area is divided into three distinct physiographic sections. These sections are the Niger Basin, the Lake Chad Basin, and the Middle Nile Basin. The World Wide Fund for Nature splits the bioregion into two ecoregions. These are separated by the Mandara Plateau. The East Sudanian savanna covers East and Central Africa. The West Sudanian savanna runs from eastern Nigeria to The Gambia.

The climate is defined by seasonal shifts in weather. Temperatures remain warm throughout the entire year. In the coldest months, average temperatures stay above 20 degrees Celsius. During the hottest months, they rise above 27 degrees Celsius. Daily temperatures can fluctuate by as much as 10 degrees. Rain arrives during the summer via the monsoon from the equator. Annual rainfall varies from 600 mm in the north to 1,200 mm in the south. In the dry winter, the Harmattan wind blows from the Sahara. This northeasterly wind brings very hot and dry air.

Plants in this region grow in a specific pattern. The savanna is characterized by the coexistence of trees and grasses. Many trees belong to the Combretaceae and Caesalpinioideae families. Some Acacia species are also very important to the landscape. The dominant grasses often belong to the Andropogoneae group. These include the genera Andropogon and Hyparrhenia. On shallower soils, you might find Loudetia and Aristida. Many people create "parklands" here. They protect useful trees like the baobab, shea, and locust-bean tree. They then grow crops like sorghum, maize, or millet underneath them.

A wide variety of large mammals live in the Sudanian savanna. You can find the African bush elephant and the northern giraffe. Other animals include the giant eland and the roan antelope. The African buffalo also lives in these grasslands. Large predators like lions, leopards, cheetahs, and African wild dogs are native here. However, most of these large mammals now have limited ranges. Their numbers have also decreased significantly. This change affects the balance of the entire ecosystem.

Humans have used this land for many different purposes. Many people are pastoralists who raise livestock. They mostly keep cattle, but some also keep sheep and goats. Other people are farmers who grow crops. They choose sorghum and millet because these plants handle low rainfall well. Since the 1970s, the region has faced increasing levels of drought. This has forced many pastoralists to move south to find grazing land. This movement has sometimes caused conflicts with settled farmers.

The history of this region is very complex and deep. Historians note that western Sudan saw early development in agriculture and trade. It was also the first region south of the Sahara where African Islam flourished. Many great empires once ruled here, such as the Kanem–Bornu Empire and the Songhay Empire. During the colonial era, European powers created new territories. They formed French Sudan and Anglo-Egyptian Sudan. These territories eventually became the modern nations of Mali, Sudan, and South Sudan. The history of the slave trade also deeply shaped the region's institutions.

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