Please note that we have been advised that the place names on the above maps do not seem to follow any consistent system of representing Arabic names in a Roman type script.
The above map shows that the great divide across Sudan is visible even from space, as this Nasa satellite image shows. The northern states are a blanket of desert, broken only by the fertile Nile corridor. Southern Sudan is covered by green swathes of grassland, swamps and tropical forest.
Source: BBC News