European exploration of Africa 1840s, so that around the midpoint of the 19th century and the beginning of the colonial Scramble for Africa, the unexplored parts were now limited to what would turn out to be the Congo Basin and the African Great Lakes. This "Heart of Africa" remained one of the last remaining "blank spots" on world maps of the later 19th century (alongside the Arctic, Antarctic and the interior of the Amazon basin). It was left for 19th-century European explorers, including those searching for the famed sources of the Nile, notably John Hanning Speke, Sir Richard Burton, David Livingstone and Henry Morton
Colonization of the Congo buying sovereignty in exchange for bolts of cloth and trinkets; playing one tribe off another; and if need be, simply shooting an obstructive chief and negotiating with his cowed successor instead. However, as he approached Stanley Falls at the junction between the Congo proper and the Lualaba (close to the general vicinity of Central Africa where he had found Livingstone six years before), it soon became clear that Stanley's men were not the only intruders. Tippu Tip, the most powerful of the Zanzibari slave traders of the 19th century, was well-known to Stanley, as was the social chaos and devastation