Aspects of this topic are discussed in the following places at Britannica.
...The river rises in the Fouta Djallon highlands of Guinea and, after traversing the old massifs, rapidly drops downward before reaching Senegalese territory. At Dagana it forms the so-called False Delta (or Oualo), which supplies Lake Guier on the south (left) bank. At the head of the delta is the town of Richard-Toll (the “Garden of Richard”), named for a 19th-century French...
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