Aspects of this topic are discussed in the following places at Britannica.
...tea. Besides the Ituri River itself, there are many broad streams that flow generally from east to west. The most notable are the Nepoko in the north, the Epulu and Nduye in the centre, and the Ibina in the south. None of these rivers is navigable, even by pirogue, for more than a few miles. The streams are fed by rains that are highly variable from month to month and from year to year....
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