There is a reference to "Bongoland" in the English translation by Ellen Elizabeth Frewer of a book originally in German by Georg August Schweinfurth published in 1874 in English as The Heart of Africa.
Starting from Khartoum in January 1869, he went up the White Nile to Bahr-el-Ghazal, and then, with a party of ivory dealers, through the regions inhabited by the Diur (Dyoor), Dinka, Bongo and Niam-Niam; crossing the Congo-Nile watershed he entered the country of the Mangbetu (Monbuttu) and discovered the river Uele (March 19, 1870), which by its westward flow he knew was independent of the Nile.
while Reclus (1886) noted the opinion of Schweinfurth (1874) and before him Lejean (1862?) thought that they might be identified with the Makaberab tribe of Atbarah (in what is now northeastern Sudan).
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Fossils of the early whale genus Saghacetus ("Sagha whale", originally named "Zeuglodon osiris") were first collected at Qasr al Sagha by German explorer Georg August Schweinfurth in January 1886 (a well-preserved dentary).