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(so͝od), swampy region, c.200 mi (320 km) long, and c.150 mi (240 km) wide, central South Sudan, E central Africa. It is fed by the Bahr el Jebel, the Bahr el Ghazal, and the Bahr el Arab, headwaters of the Nile. Thick aquatic vegetation (sudd) disperses the river water into numerous channels. About half the water is lost through evaporation and absorption before leaving the Sudd.

The vegetation hinders navigation and long barred attempts to trace the Nile to its source. An Egyptian expedition first succeeded in crossing the Sudd in 1840. It took much effort to clear (1899–1903) a channel for regular navigation, and constant maintenance is necessary to keep it open. Construction on a canal to circumvent the Sudd and drain swampland for agriculture began in 1978 but was suspended in 1983.

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References in periodicals archive ?
The Sudd is also important for the region's pastoralist communities.
In the northern battleground state of Unity, thousands of civilians are trekking through the vast Sudd swamplands to reach the village of Nyal, away from fighting.
Based on the parents' accounts to police, her eyes suddenly flickered open and she was t a po sudd open a given water before being returned to hospital.
Fatah said the oil flowed into a tank on Sudanese territory from South Sudan's Block 5A operated by Sudd Petroleum Operating Company (SPOC), a joint venture between Malaysia's Petronas and South Sudan's government.
Treasure hunter Porter Stone is hunting for the first Egyptian's Narmer's tomb located south of the Egyptian border near the Sudd. The forsaken landscape is neither land or water and Stone has constructed a free floating archaeological base in this desolation.
Pictured are: Whole Foods, Jim Sudd, executive VP of business development and Norah Smith, vice president of real estate, Jacqueline glinger and Chase Welles of SCG Retail.
Roedd sudd yr aeron yn arfer cael ei ddefnyddio er mwyn llifo deunyddiau.
After Mongalla, the Bahr Al Jabal enters the enormous swamps of the Sudd region of Sudan.

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