Sudan (region) to the present-day country of Sudan, the western part of which forms part of the larger region, and from which South Sudan gained its independence in 2011. The Sudan region extends in some 5,000 km in a band several hundred kilometers wide across Africa. It stretches from the border of Senegal, through southern Mali (formerly known as French Sudan when it was a French colony), Burkina Faso, southern Niger, northern Nigeria, northern Ghana, southern Chad, the western Darfur region of present-day Sudan, and South Sudan. To the north of the region lies the Sahel, a more arid Acacia savanna region
Colonial Mauritania had been created in 1895, Mauritania was closely tied to its administrative structure and had its annual budget appended to that of the AOF. On December 4, 1920, by a decree of the Colonial Ministry in Paris, Mauritania was officially included in the AOF with the six other French West African territories—Senegal, the French Sudan, Guinea, Côte d'Ivoire, Dahomey (present-day Benin), and Niger. The AOF was organized pyramidally under a centralized federal structure in Dakar. Directly appointed by the president of the French Republic, the governor general of the AOF came to have a great deal of power because of