Consequently, the pattern of water availability and intrinsic characteristics in each water basin is heterogeneous and very relevant to all water supply-side decisions. For instance, the Sebou water basin holds 30 per cent of surface water resources and groundwater and, although it represents only 6 per cent of the total area of Morocco, 18 per cent of the country’s population lives within it. The northern (Loukkos, Tangier and Mediterranean Coastal) and Sebou basins cover nearly 7 per cent of the area of the country and more than half of the surface water resources. Conversely, the Tensift, Bouregreg and other southern water basins exhibit water security insufficiencies.