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In page Nile:

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With a total length of about 6,650 km (4,130 mi)[a] between the region of Lake Victoria and the Mediterranean Sea, the Nile is among the longest rivers on Earth. The drainage basin of the Nile covers 3,254,555 square kilometers (1,256,591 sq mi), about 10% of the area of Africa.[5] Compared to other major rivers, though, the Nile carries little water (5% of that of the Congo River, for example).[6] The Nile basin is complex, and because of this, the discharge at any given point along the main stem depends on many factors including weather, diversions, evaporation and evapotranspiration, and groundwater flow.[citation needed]