Riverbanks are usually subject to constant erosion due to water flow, floods and natural processes, which compromises the stability of the banks and represents a risk for nearby infrastructure and communities. Given this situation, an investigation was carried out on a section of the Lurín River, Peru, to improve the protection of its banks by implementing geomattresses. The study compared three cases using the Slide software. The first case modeled the slope in its natural state, the second considered the scour in the riverbed based on a hydraulic analysis in Hec-Ras, and the third evaluated the implementation of geomattresses. The results, expressed in safety factors, showed that the first case presented instability with factors less than 1. In the second case, scour further reduced the safety factors. Finally, after profiling the river and implementing geomattresses in the third case, the safety factors increased, complying with the slope stability regulations. The findings highlight the effectiveness of geomattresses in preventing erosion and improving stability in the Lurín River, which has important implications for risk management in landslide-prone areas and for the conservation of sensitive ecosystems.