Several Thematic Cartographies and a Spatial Planning Proposal for the Wilaya du Brakna, in the Republic of Mauritania; a Two-Dimensional Hydraulic Study of the Senegal River and its tributaries by remote sensing. This project aims to help the government of Brakna to know and understand its territory in order to improve land governance in favour of small producers and to improve the management of irrigated, rainfed or receding land in Brakna.