evidence: The down Ouémé valley is a very interesting river corridor in the port and interior hinterland relationship. The river benefits from the contributions of other water courses which allow it to have permanent water in its basin. These contributions come from the Zou River in the West which has its source in North Togo and joins the Ouémé in the locality of Gangban, commune of Bonou. At the same time, it benefits from the waters of the Okpara River in the East which, along the Beninese borders for 156km from the North-East of Parakou, swells the Ouémé at Okpa hamlet in the locality of Bétékoukou (commune of Dassa- Zoume). [...] However, the challenges linked to the realization of the planned development plans, the professionalization of river transport players, the financial support and adequate training of traditional fisheries, the strengthening of the capacities of artisan builders for the modernization of navigation equipment manufacturing units. The water bodies of Southern Benin are just waiting for large-scale investments to better contribute to the economic growth of the country. The biggest prospect is to provide it with territorial river ports which will offer opportunities to river-lagoon transport companies, people carriers and hinterland customers, the use of a new lagoon space for the exchange of goods from or to the port of Cotonou at competitive costs.