Sudd

The Sudd (Arabic سد, sad, "barrier"), also known as the Bahr al Jabal, As Sudd or Al Sudd, is a vast swamp in South Sudan, formed by the White Nile. The word “sudd” is derived from the Arabic word “sadd”, meaning “block.” The term 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.