<p>The difficulty in managing water supply, coupled with increasing water scarcity due to climate change, especially in semiarid regions, calls for advanced hydrogeological methods for sustainable groundwater management. This study presents a comprehensive methodological procedure for the geological and hydrogeological characterisation of aquifers to improve water resource management and governance, especially in relation to implementing managed aquifer recharge (MAR) techniques. The methodology applied in Guillena-Cantillana Groundwater Body (G-C GWB) within the Niebla-Posadas aquifer in southern Spain integrates geological techniques such as cross-section sketching, spatial interpolation and 3D modelling with hydrodynamic analysis to understand aquifer geometry and lithological variation. For this purpose, data from 135 lithological borehole logs were collected, processed and interpreted, along with piezometric level measurements carried out in the G-C GWB from 1982 to 2022. This approach identifies zones with the highest potential for MAR, particularly where the water table has significantly declined and aquifer materials are more permeable. This case study defines the aquifer geometry and estimates the unsaturated volume available for groundwater storage, highlighting the suitability of G-C GWB for MAR applications. The methodology is cost-effective, leveraging existing data with supplementary field surveys, and is adaptable to diverse hydrogeological contexts, including semi-confined aquifers. This approach optimises resources and improves the efficiency of water management by focusing efforts on specific areas with favourable hydrogeological characteristics. The procedure provides a detailed understanding of aquifer behaviour, which is essential for sustainable groundwater management, and provides a model for future research and practical applications in diverse hydrogeological settings worldwide.</p>