No Swampland Next to Desert in Sudan—The Premise Is Incorrect

The question contains a geographic misconception. Sudan does have vast deserts (Sahara, Nubian, Bayuda), but there are no swamps adjacent to them.

🌍 Sudan's Actual Geography:

• North: Hyper-arid desert (Sahara extensions).
• Central: Semi-arid Sahel (acacia scrub, seasonal grasslands).
• South: Tropical savanna, wetlands (Sudd—one of world's largest floodplains, not swamp).
• East/West: Red Sea hills, Marrah Mountains, Darfur plateau.

💧 The Sudd (South Sudan, formerly southern Sudan):

Massive seasonal wetland/floodplain on White Nile (~57,000 km² wet season). It's a riverine floodplain, not a swamp bordering desert. Hundreds of km separate it from northern deserts.

The transition is gradual: desert → semi-desert → savanna → floodplain—no abrupt swamp-desert interface.