In 2008, intense and concentrated rainfall caused numerous mass movements in Santa Catarina state. In this work we outline the mapping of areas susceptible to landslides and the validation of the model SHALSTAB, using the mapped scars of the landslides that occurred in November 2008 in the watershed of Ribeirão Baú. The method consisted of the mapping of geotechnical units and determination of the effective parameters of soil resistance. Finally, based on the SHALSTAB model, a map of susceptible areas within the watershed was generated, using topographic data taken from a DTM and the geotechnical data. The main result, when analysing the number of landslides in relation to the area of each class, has been found to be that a higher number of ruptures occur in the unconditionally unstable and saturated class, and the highest susceptibility classes and the number of scars are correlated.