Niger delta. Infrared satellite image of the River Niger delta in Nigeria. North is at top. In the infrared range clear water is blue/black, sediment laden water is light blue, vegetation is red, buildings are grey and clouds are white. The Niger splits up into many small rivers which fan out over the delta. The sediment plumes at the mouths of these rivers are visible. At top centre is the town of Port Harcourt. On average 6 million litres of water flow into the sea every second from this, the largest delta in Africa. Image taken by the French SPOT-3 satellite in January, corresponding to the dry season in the Niger's catchment area.
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