The action of the geodynamic agents (external and/or internal), or even the human activities, can cause changes in the structure of a slope that may result in an imbalance between the internal and the external forces acting on the ground. The aim of this study is the analysis of the stability of a natural rock slope located along the Távora river, Northern Portugal. The geological mapping of the area and the use of stereonet to determine the main sets of joints were the starting point for the performed analysis. It was complemented with the study of different factors regarding the stability of the rock mass. The geomechanical characterization of the rock mass was also used, with the application of Bieniawski and Romana ratings. The methodologies applied proved to be a simple but effective way to describe the potential behavior of the rock mass with respect to the probability of occurrence of slope movements.