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Rivers are used for transportation, irrigation, generating energy and performing work, such as turning waterwheels. Rivers are also vital sources of fresh water for both industrial and residential applications.
 The 25 Longest Rivers in the World  The River as a Lifeline  The River as a Boundary  Geography links. The river begins in Guinea and runs east through Benin, Guinea, Mali, Niger, and Nigeria.The source is an almost 90-degree turn south, to the Gulf of Guinea. One of the main sources of income from the river is oil.The 25 Longest Rivers in the World  The River as a Lifeline  The River as a Boundary  Geography links. The river begins in Guinea and runs east through Benin, Guinea, Mali, Niger, and Nigeria.