Unit+4+-+The+SHAPE+of+Africa+South+of+the+Sahara 

=Pre-Colonial African Empires of Ghana, Mali, and the Songhai= media type="custom" key="28840740"

=The Lost Kingdoms of West Africa= BBC Four media type="custom" key="28840754" https://www.youtube.com/watch?v=BNYfCaRlMy0