The study area is part of the Western High Atlas. The plain of Ouled Bou Sbaâ is located hundred kilometers west of Marrakesh, it is part of the Atlantic trays area. It is a complex basin, with a succession of synclines and anticlines oriented NE-SW between the mountain chain of the High Atlas and the Tensift river.The compilation of geological data, drilling data, geological sections and the analysis of the reconnaissance boreholes logs show that this area is constituted by thick sedimentary series dated from Paleozoic to Quaternary. Hydrogeologically, these series show the superposition of two aquifers; the first one is an unconfined groundwater flow system housed in the Quaternary, Eocene and Turonian; the second one is a deep confined groundwater flow system and located at the heart of the Cenomano-Turonian aged synclines. The feeding of these two reservoirs is ensured by the infiltration of surface waters of the high Atlas's mountains as well as by stoma at the piedmont.By establishing piezometric maps, it has been noticed that on one hand the free groundwater layers have a hydraulic continuity. On the other hand the confined aquifer located at the Sidi Mokhtar's syncline, in the north of the working area has a flow oriented from SSW towards NNE while the one in the syncline of Idouirane situated in the south has a groundwater flow oriented from SW to NE. As there is a separation materialized by the Marmouta anticline, the two aquifers do not have hydraulic continuity.