Groundwater recharge is understood as that fraction of the water which percolates the soil and , traveling through the unsaturated zone, avoids evapotranspiration and reaches the aquifer. Due to the various phenomena included and their uneven spatial distribution, its point estimation is prone to errors and other space-sensitive methodologies are preferred. This paper, dealing with Salliqueló County (794 km2 in western Buenos Aires Province), presents a combined processing of land use (from Landsat TM images) and soil type (from INTA soil maps). For the various combinations, Thornthwaite and Matter soil-monthly water budgets were calculated. Results show annual recharge values between 124 and 149 mm, spatially distributed. Is concluded this methodology is an appropriate better estimator of the regional aquifer recharge.