David Livingstone (1813-73) was an explorer in Africa who sought to discover the sources of the Nile River. He is credited with numerous important discoveries concerning watershed in central and southern Africa, including the Zambezi River, Victoria Falls, Lake Ngami, and Lake Malawi. Born in Scotland, Livingstone first traveled to Africa as a missionary, and was intent on ending the slave trade in Africa. Engraved by D. J. Pound from a photograph by Mayall.