Abstract: The aim of this study is to evaluate physicochemical parameters in the lagoonal system and coastal rivers of Côte d’Ivoire to appreciate their spatial variation. Water samples were collected at 16 stations for phosphorus, nitrogen, pH, salinity, temperature and conductivity analyses. Sampling was carried out during two seasons, characterizing the water of the lagoonal system of Côte d’Ivoire, October 2006 for wet season and March 2007 for dry season. These samples were collected in four rivers and two lagoons. It was found that, the phosphorus concentrations (1.77 mg L-1), as well as the ammonia-nitrogen (0.65 mg L-1) and nitrate-nitrogen concentrations (1.09 mg L-1) were high throughout the area, indicating extensive pollution. Although, the nitrite-nitrogen concentration was relatively low, it is at the upper end of what might be considered normal, thereby indicating an anthropogenic origin. The highest concentrations of nutrients obtained in the area of Azito in the Ebrié lagoon are indicative of high stress on a lagoonal system from a particular industrial pollution. The study revealed also that the dilution of the water of the lagoonal system during the dry season by the oceanic water reduces considerably the concentrations of nutrients and increases conductivity and water salinity.