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.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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