In 1876 the explorer Henry Morton Stanley came upon the Lualaba River in what is now the Democratic Republic of Congo. Stanley was convinced that the Lualaba was connected to the great Congo River which the Portuguese had first sighted 400 years earlier on Africa's west coast. Although it proved easier than travelling across country, the river offered dangerous sailing, especially when his expedition encountered the Wagenia tribe and the cataracts of the middle Congo.

Stanley...
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