The objective of this work is to elaborate a “glossary of the fluvial morphologies”, through the identification and the validation of the fluvial morphologies, collecting within a global synthesis the studies about river instability and intervention criteria on the drainage basin. The glossary could represent a useful tool to address the stakeholders toward a better and correct planning of fluvial and peri-fluvial interventions according to the natural fluvial dynamics. It will be managed by a multilayer informative system where the first layer contains the definition and a brief comment for all the individuated morphologies in order to identify the main characteristics and principal phenomena. The increasing level is represented for a great number of morphologies by some reports that include a phenomenological description, photos and schemes, opportune methods of investigation and analysis, interpretative models and intervention criteria, coming from literature and developed during the present work.