What is the very bottom country in Africa?

The southernmost country in Africa is South Africa, specifically the area of Cape Agulhas, which is the southern tip of the continent. However, if you are referring to the southernmost point of land, that distinction goes to an area in the territory of the British Overseas Territory of Tristan da Cunha, which is part of Saint Helena, Ascension, and Tristan da Cunha. This territory is often considered in geographical discussions about southernmost points in Africa.