By far the most significant factor in African pre-history is the ethnogenesis and spread of the Bantu-speaking peoples associated with the Mambilla Region of the Nigeria-Cameroon borderlands (the Mambillobantu Region) in West Africa. The Bantu expansion, which many authorities believe to have begun from this region between 2000 and 1500 B.C, led to the ramification of over one-third of Africa by the same category of Africans, the Bantus, covering some twenty-eight African countries today. Most of the people existing in the central and southern Nigeria-Cameroon border, southern Cameroon, central, eastern and southern Africa today are a result of the Bantu expansion from the Mambilla Region or the result of a fusion between the Bantu migrants and Nilo-Saharans (as in a few communities in East Africa) or Bantu and Pygmies (as in some communities in central Africa). One in every three Africans today is Bantoid. The Mambilla Region itself was not totally evacuated and the area is still occupied by the Macro-Bantu-speaking Mambilloid peoples who represent the remnants of that great African expansion.
〔(news ). Oas-helicopters.org (2008-09-27). Retrieved on 2011-04-09.〕
Bommi Town (Gembu) is about away/close to the Kyiumdua or Donga River valley.〔(Mambilla Plateau ). discovertaraba. Retrieved on 2011-04-09.〕