Weathering is one of the challenges which threaten most Egyptian monuments. It plays a role in destroying the mineral components of monumental buildings. It is also considered one of the most dangerous natural problems facing monumental buildings of different kinds. Weathering is no less influential in terms of its devastation from the other natural dangers. However, it has a slow effect that takes long years and increases over time and based on the frequency of its cycle inside the pores of the building stones.
        Kousa Pasha Fort has been exposed to damage as a result of being influenced by various and interlocking weathering operations. The rate of weathering varies according to the materials of construction. That is, weathering is the product of an interaction between the internal structure of the stones and their mineral components and the prevalent ecological conditions.
        The present study aims to investigate the geomorphological effects of weathering processes on Kousa Pasha Fort. This is to explain the reality which the fort experiences. Therefore, appropriate and urgent decisions can be made, based on such evaluation, as regards the restoration and maintenance of the fort.