Sudd - a giant swamp, located in the valley of the White Nile, and is one of the largest wetlands in the world. However, this region is populated enough for one simple reason.
Oddly enough, but it Sudd area is considered the most fertile in Southern Sudan, because the rest of the territory - the desert and arid plateau. On the territory of the marshes are home to over 400 species of birds and about 100 species of mammals. Also, quite a variety of local flora. The total area varies, depending on the rainy season, from 30 to 300 thousand square kilometers, which is almost equal to the area of Italy. Marshes really impassable. On them is almost impossible to move any ground transportation or swimming. These living conditions restrict the ability of scientists and researchers, so here is still a lot of "white spots».