The swamps of Sudd in South Sudan are among the largest wetlands in the world. Located in the delta of White Nile, it covers the average area of 30,000 sq. km. During the raining season the wetland can extend to over 130,000 sq. km, which is as much as the size of England. The Sudd is considered almost impenetrable overland or by boat. The abundant water-loving plants form the massive moving blocks. The swamps of Sudd are inhabited by the Dinkas, one the Sudanese ethnic groups.

The Sudd, is a vast swamp in southern Sudan, formed by the White Nile.

Its size is highly variable, averaging over 30,000 square kilometers. During the wet season it may extend to over 130,000 km².

The sunlight and water contribute to the proliferation of plants that have no roots and float on the surface, forming a sort of a live carpet. Eventually plants become larger, thicker which with time creates a dense floating plant life of the swamp. Apparently, it is so strong that it can hold the weight of large animals.