Unravelling the characteristics of a low-enthalpy geothermal reservoir is of significant importance for optimizing the production of these sustainable energy sources. This paper employs a multidisciplinary approach to precisely explore a reservoir in northeastern Tunisia. Utilizing diverse data sets, the established conceptual model highlights the geometry of deep sedimentary series, emphasizing notable lineaments that serve as preferential axes for groundwater circulation. Groundwater chemistry is regulated by processes such as evaporation and the dissolution of evaporate minerals. Reverse ion exchange has been identified for the springs and well W2, and normal ion exchange is observed for other wells. Isotopic analyses confirm the meteoric origin of thermal water. According to diagrams from the Institut International des Recherches Géothermiques and Giggenbach, the groundwater is derived from deep circulation in sandstone levels and it is located in an immature water field, not in equilibrium with the reservoir rocks. Geothermometric results indicate groundwater temperatures ranging from 75 to 97°C for springs and from 38 to 90°C for wells. This comprehensive exploration provides a thorough knowledge of the northeastern geothermal reservoir, establishing the framework for educated decision-making and responsible use of the region's geothermal resources.

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