Villagers crossing the Nile, northern Sudan Five Cataracts interrupt the flow of the Nile from south of Aswan to little north of the city of Berber in Central Sudan. This makes sailing impossible except for the short distance that separate from one cataract to the other. Agricultural lands are available in the Dongola Reach and along the curve of the nile valley as far south as Abu Hamed. this fertile region of the Nile valley produced enough agricultural supply for prominent Nubian kingdoms and cities to develop.
Nubian Herder (Sudan) Nubia is part of modern day country of Sudan. Howeaver, historically the land of Nubia Stretches from Aswan (the modern day the country of Egypt) in the north of Kosti in the White Nile and Sinnar in the Blue Nile in the south, and from the red sea coast to Kordofan and the Libyan desert in the west. Most of Sudan's topography is consisted of the Nile valleywhich provide fertile agriculture and abondant pasture for settled human communities. Because of the availability of food along the nile valley human community there grew in number more than in any other location in Sudan. As a result the first unified civilisation in the world developed there.
However unlike the Nile valley of Egypt many portions of the Nile valley in Nubia are and were not supportive for extensive agriculture as a result pasture was a main source of food for the Nubians more than the ancient Egyptians. From Aswan to Lower Wadi Halfa the Nile cut through a barren stretch of desert that is not sopportive for the living of any sort of human community.