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The Eastern Haouz in Morroco is an agricultural region in full demographic, economic, and touristic expansion. To meet the increasingly growing demand of water, this paper focuses on the geological modelling of the basin geometry and on understanding the groundwater circulation. This work presents a geological model of the study area by integrating geological and hydrogeological aspects. It aims to describe a natural complex object by simplifying it to a conceptual and a numerical model. This is aimed at providing a better understanding of the geometry and the characteristics of the reservoir. The cross-sections and the treatment of deep boreholes data confirmed the results of geological modeling. It, however, shows that the region is synclinal and surrounded by two outcrops: the Jebilet and the High Atlas mountains. At the South of the plain, the large thickness of the cover gives a good accumulation of water and ensures the reservoir supply. The rise European Scientific Journal August 2018 edition Vol.14, No.24 ISSN: 1857 – 7881 (Print) e - ISSN 1857- 7431 54 of the basement in the north of the plain imposes a dividing line with two groundwater flow directions.