This morphological and hydrosedimentological study was carried out with the aim of understanding the evolution of the bottom and the sedimentary dynamics of the Potou lagoon in Côte d'Ivoire from the superposition of two bathymetric maps spaced ten years apart. With an average depth of 2.11 m, the Potou lagoon has undergone morphological changes from 2008 to 2018. This is marked by a reworking of the sediments on the entire lagoon bottom. There is a fattening phenomenon whose volume is estimated at + 66.8 hm³ of sediment deposited in the lagoon. The estimated sedimentation rate is estimated at around 2.65 cm/year. These deposits are marked by a preponderance of shoals over the entire lagoon. As for erosion, it is estimated at a volume of - 8.5 hm³ of sediment. This results in a sedimentary budget of + 58.3 hm³ corresponding to a surface of 12.45 km2 or 54.6% of the total surface of the lagoon during these ten years. The bathymetric map and the sedimentary budget of the Potou lagoon are necessary tools for the use of the body of water by users. Thus, the risk areas determined on the bathymetric map, such as shoals and whirlpool points generated by depressions, will be easily avoided.