

Enjoying a plate of nutritious mitoo during a a project to promote African leafy vegetables. Photo: S. Mann/Bioversity.
The sub-Saharan Africa (SSA) region comprises nearly 50 countries grouped into five sub-regions: Eastern Africa, Southern Africa, West Africa, Central Africa and the islands of the eastern coast of the continent, Madagascar, Mauritius, the Comoros and the Seychelles.
The sub-Saharan region includes three major regions of crop diversity -- the Ethiopian highlands, the Sahelian transition zone with the delta of the Niger, and the humid forest zone of West and Central Africa -- and people there have given the world some of its most important crops.
Coffee's centre of origin is in the highlands of Ethiopia, which is also a centre of diversity for sorghum, lentil, wheat and barley.
Tropical West Africa is a centre of origin and diversity for African rice (Oryza glaberrima), oil palm, yams and cowpeas.