The plain of Bou Areg and the plain of Gareb, situated in the Northeast of Oriental Morocco, are characterized by a climate of the arid to semi-arid type, with an oceanic influence near the coast (ribs). The maximal and minimal average temperature are respectively 26,2°C and 12,3 °C, the average yearly rainfall is 303.5 mm, while the average annual evaporation is 1501.4 ml.
According to the data of the drillings, geological formations extend from Triassic to Plio-Quaternary ages. The marls of the Miocene represent the Substratum of both ground waters, while the brown Silt represents the roof. The groundwater of Bou Areg circulates mainly in more or less clayey gravelly loam, while the aquifer of Gareb is mainly made up by shell limestones of Villafranchien.
The piezo-metric map of April, 2018 demonstrates that at the level of the groundwater of Gareb, subterranean waters flows to the groundwater of Bou Areg, which is a low level area, the groundwater of Gareb is drained by Oued Selouane, and the latter, in its turn, feeds the groundwater of Bou Areg. The Three watersheds are clearly marked in the study area including four in the groundwater of Bou Areg towards the lagoon of Bou Areg and the only one in the groundwater northwards.
Concerning the hydrochemistry, the study is divided into two phases, the study of the parameters measured in situ in the countryside of April, 2018 (PH, electric Conductivity), the other study focuses on campaigns whose analysis focus on the conductivity, and the major elements . The evaluation of the quality of these waters has revealed that these waters are of a very high and normally unusable salinity whether for the consumption or for the irrigation.
Keywords: The oriental northward Morocco, Plain of Bou Areg, Plain of Gareb, Geology, Hydrogeology, Hydrochemistry, Salinization.