Describe the major physical regions of Sub-Saharan Africa and explain the impact of Bantu migration and colonial-era borders on the region's ethnic and linguistic map.
Sub-Saharan Africa -- the portion of the continent south of the Sahara -- contains an extraordinary range of physical geography. The Sahel is a semi-arid transition zone stretching across the continent just south of the Sahara, vulnerable to drought and the slow spread of desert conditions. Much of East and Southern Africa is covered in tropical savanna, while the Congo Basin holds the second-largest rainforest on Earth after the Amazon. The Great Rift Valley, a massive tectonic rift running through East Africa, has also yielded some of the world's most important early human fossil discoveries. Major rivers -- the Nile, Congo, Niger, and Zambezi (home to Victoria Falls) -- have long shaped settlement and trade across the continent.
Sub-Saharan Africa is home to extraordinary linguistic diversity, with well over a thousand distinct languages, most belonging to the Niger-Congo family. Over roughly two thousand years, Bantu-speaking peoples migrated out of West-Central Africa and spread agriculture and their languages across most of the southern two-thirds of the continent, one of history's most significant and far-reaching migrations. Colonial-era borders -- drawn by European powers at the 1884-85 Berlin Conference largely as straight lines with little regard for existing ethnic or linguistic boundaries -- still shape many modern states and remain a source of tension in some regions today. Religiously, the region is diverse: Christianity is dominant across much of the south and center, Islam is dominant across the Sahel and much of the east and west coasts, and indigenous and traditional belief systems are practiced -- often blended with either -- across many communities.
Mastery looks like: They can describe Sub-Saharan Africa's major physical regions, explain the Bantu migration's impact on the language map, and connect colonial-era borders to modern ethnic and political tension.
Common stumbles: Treating Sub-Saharan Africa as culturally or linguistically uniform; forgetting that colonial borders and the much older Bantu migration are two separate historical processes that shaped the same map at very different times.