Those whose courses are entirely in French Guinea include the Cogon (or Componi), the Rio Nunez, the Fatalla (which reaches the sea through an estuary named Rio Pongo), the Konkure, whose estuary is named Rio Bramaya, the Forekaria and the Melakori.
The Cogon, Fatallah and Konkure are all large rivers which descend from the plateaus through deep, narrow valleys in rapids and cataracts, and are only navigable for a few miles from their mouth.
On the banks of the Cogon dwell the Tendas and Iolas, primitive Negro tribes allied to those of Portuguese Guinea (q.v.).
To-day the Baga occupy the coast land between the Cogon and the Rio Pongo, and the Landuman the country immediately behind that of the Baga.