Why is the Al-Sudd region difficult to navigate?

The Al-Sudd region is difficult to navigate because it acts as an almost impenetrable barrier to river travel. This is primarily due to the Al-Jabal River overflowing into a flat, saucerlike clay plain, which creates a complex network of innumerable swamps, lagoons, and side channels.1

Navigation is further obstructed by the dense, luxuriant growth of tall papyrus, aquatic grasses, and water hyacinth, which significantly slow the river's flow. These conditions create a challenging environment that has historically hindered passage through the region. Efforts to bypass these obstacles, such as the construction of the Jonglei Canal, were initiated to provide a more direct and navigable channel, but these projects have faced significant interruptions.1