The Machar Marshes are a large area of wetlands in the state of Upper Nile,

South Sudan South Sudan (; din, Paguot Thudän), officially the Republic of South Sudan ( din, Paankɔc Cuëny Thudän), is a landlocked country in East Africa. It is bordered by Ethiopia, Sudan, Central African Republic, Democratic Republic of the ...

. Estimates of their size vary. A 1950 study put the area of swamp at 6,500 km². A 1980 study put the area of permanent swamp at 8,700 km²., 60% of which was grass and forest.Sutcliffe and Parks, p.113 The marshes are fed by waters from the Khor Machar (a distributary of the

Baro River The Baro River ( am, ባሮ ወንዝ) or Baro/Openo Wenz, known to the Anuak as Openo River, is a river in southwestern Ethiopia, which defines part of Ethiopian border with South Sudan. From its source in the Ethiopian Highlands it flows west ...

), the Yabus River and the Daga River. At times of high water they are also fed by spill from the

Pibor River The Pibor River (also called the River Pibor) is a river in eastern South Sudan, which defines part of South Sudan's border with Ethiopia. From its source near Pibor Post it flows north for about , joining the Baro River to form the Sobat River, ...

. The marshes are drained by the

Adar River The Adar River (or Khor Adar), known to the Dinka as the Yal, is a tributary of the White Nile in the state of Upper Nile, South Sudan South Sudan (; din, Paguot Thudän), officially the Republic of South Sudan ( din, Paankɔc Cuëny Thud ...

, a tributary of the

White Nile The White Nile ( ar, النيل الأبيض ') is a river in Africa, one of the two main tributaries of the Nile, the other being the Blue Nile. The name comes from the clay sediment carried in the water that changes the water to a pale colo ...

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* * {{Coord, 10.3833, N, 32.2500, E, source:wikidata, display=title Upper Nile (state) Flooded grasslands and savannas Grasslands of South Sudan Swamps of Africa Wetlands of South Sudan