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Kamdem (1993) and Kamdem and Teugels (1998; 1997; 1998) have studied the ecology of fishes in the NtemRiver of Cameroon and Mbega and Teugels (2003) completed a study of fishes of the Lower Ogowe of Gabon.
The main river systems within the Lower Guinea ichthyofaunal province are, from Nigeria to the Congo mouth: the Cross, Wouri, Sanaga, Nyong, Ntem, M'bini (or Benito), Ogowe, Nyanga, Kouilou/Niari, and Chiloango in the third figure.
Similarly, there is close proximity between the upper reaches of the Ivindo River in Gabon and the NtemRiver, suggestive of a past river capture of the upper Ivindo by the Ntem.
A river basin comprises all the land that drains through that river and its tributaries into the ocean or an internal lake or sea.
Discharge is considered to be the output of the river basin's main stem channel at the ocean.
River basins such as the Colorado that are deemed 'exotic' lose a great deal of water volume at the end of their path due to natural and man-made withdrawals.