Niger River, Mali
The Niger River and smaller rivers and streams flow northward out of Lake Debo in landlocked Mali in Western Africa. This region is part of the Inner Niger Delta, an intricate combination of lakes, river channels, and swamps with occasional areas of higher elevation.
Known as the Macina, this wet oasis in the African Sahel is one of the largest wetlands in the world and provides habitat both for migrating birds and for West African manatees. The fertile floodplains also provide much-needed resources for the local people, who use the area for fishing, grazing livestock, and cultivating rice. This Terra image from 2003 shows the region during the dry season.
On the right, water in rivers, streams, and lakes appears blue. On the left, the water turns greener, perhaps because of sediment. The
reddish ridges running from east to west in the bottom half of the image are dunes. The pale-gray or white areas between the dunes
are flat areas of silt, clay, or sandy soil. Blue shows where water has filled in between some of the dunes.