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The Sudd ▬ The White Nile in Southern Sudan
The Sudd (a s-Sudd or al-Sudd) is a vast swamp in South Sudan, formed by the White Nile's Baḥr al-Jabal section. The Arabic word sudd is derived from sadd (سد), meaning ‘barrier or ‘obstruction. The term ‘the sudd’ has come to refer to any large solid floating vegetation island or mat. The area which the swamp covers is one of the world's largest wetlands and the largest freshwater wetland in the Nile basin.

For many years the swamp, and especially its thicket of vegetation, proved an impenetrable barrier to navigation along the Nile. For this reason, the search for the source of the Nile was particularly difficult; it eventually involved overland expeditions from the central African coast, so as to avoid having to travel through the Sudd.