Overview
Eastern Africa, also called East Africa, is a subregion at the eastern edge of the African continent, distinguished by a unique geographical, historical, and cultural landscape. It stretches from the Horn of Africa in the north through the African Great Lakes in the west, along the Indian Ocean coast, and down into Southeastern Africa. Depending on the definition used, the region encompasses between 14 and 18 sovereign states, along with a handful of island territories, making it one of the most populous and diverse subregions of Africa. A 2017 estimate placed the region's population at over 537.9 million people, while more recent figures put the total closer to 455 million, with Ethiopia as the most populous country and Seychelles as the smallest and least populous.
Defining the Region
There is no single agreed-upon definition of Eastern Africa, and its borders shift depending on political, economic, or geographic criteria.
- Narrow English-language usage: Often refers simply to Kenya, Tanzania, and Uganda, reflecting their shared history of British colonial administration and later cooperation.
- United Nations Geoscheme: The standard used for international statistics and development reporting, encompassing 18 sovereign states plus the territories of Mayotte and Réunion. Sovereign countries under this scheme include Burundi, Comoros, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Malawi, Mauritius, Mozambique, Rwanda, Seychelles, Somalia, South Sudan, Tanzania, Uganda, Zambia, and Zimbabwe.
- African Union (AU): Recognizes 14 member states, including Sudan, but excluding Burundi, Malawi, Mozambique, Zambia, and Zimbabwe.
- East African Community (EAC): A regional economic and political bloc rather than a strict geographic definition, currently comprising Burundi, the Democratic Republic of the Congo, Kenya, Rwanda, Somalia, South Sudan, Tanzania, and Uganda.
- Horn of Africa: A distinct geopolitical subregion within East Africa, made up of Djibouti, Eritrea, Ethiopia, and Somalia.
Island nations and territories such as the Comoros, Mauritius, Seychelles, Réunion, Mayotte, and the Scattered Islands are also generally included, given their close ties to the Indian Ocean trade networks. Parts of Mozambique and Madagascar, though sometimes grouped with Southern Africa, share deep historical and cultural links with East Africa through these maritime connections.
Geography and Climate
The geography of Eastern Africa is highly varied, ranging from coastal lowlands to cooler highland plateaus where many major population centers are located. The region is shaped by the Great Rift Valley system, the East African Plateau, and a long Indian Ocean coastal belt. Notable landmarks include Lake Victoria, the second-largest freshwater lake in the world by surface area, and Lake Tanganyika, the second-largest by volume. The landscape also features active volcanic zones, expansive savanna, deserts, and highland farming regions.
Unusually for an equatorial region, the climate is mostly arid or semi-arid, becoming progressively wetter further south. The region is regularly affected by tropical cyclones, with North Indian Ocean cyclones striking near the Horn of Africa and South-West Indian Ocean cyclones affecting the southern areas. This climate variability makes Eastern Africa particularly vulnerable to cycles of drought and flooding, which have contributed to food insecurity and climate-driven migration throughout the 20th century.
History
Human Origins
Eastern Africa is widely regarded as a cradle of humanity. Genetic and fossil evidence suggests that archaic Homo sapiens evolved into anatomically modern humans in the Horn of Africa roughly 200,000 years ago before dispersing across the globe. Some of the earliest hominin remains have been unearthed in the region, including finds in Ethiopia's Awash Valley, Kenya's Koobi Fora, and Tanzania's Olduvai Gorge. At Olorgesailie in Kenya, evidence dating to about 320,000 years ago points to early modern human behaviors, including long-distance trade networks, use of pigments, and possible projectile-point making. The "Out of Africa" migration is thought to have passed through the region via the Bab-el-Mandeb strait, which was narrower and more easily crossed tens of thousands of years ago than it is today.
In the southern parts of the region, Khoisan hunter-gatherers persisted until relatively recent times, while the Ethiopian Highlands saw early agricultural development around 7,000 BCE, aided by domesticated donkeys and crops such as teff. Diseases carried by the tsetse fly and other lowland barriers slowed the southward spread of farming for many centuries.
Ancient Kingdoms and Trade
The region now covered by Djibouti, Eritrea, Ethiopia, Somalia, and Sudan's Red Sea coast is thought to correspond to the land the ancient Egyptians called Punt, which maintained trade relations with Pharaonic Egypt as early as the 25th century BCE. Later, the Kingdom of Aksum, centered in present-day Eritrea and northern Ethiopia, flourished as a major trading empire from roughly 100 to 940 CE, exporting goods such as ivory and minting its own currency.