The aim of this paper, is to demonstrate the use of GIS technology in the study of knickpoints, by processing geographical, geomorphological and geological variables. The final result is the creation of different level databases and thematic maps and their combination in order to help scientists to deduce geomorphological conclusions. These GIS techniques help the user to locate probable knickpoints fast and accurately, minimizing the subjectivity of the processing. This methodology can be easily applied to any set of similar nature primary data, without any modifications. As a case study we used Leukadaisland (West Greece) because it gathers a variety of lithologies, a sufficient rain state, a polymorphic relief and tectonic activity. The result of this study is a field cross-tested method based on GIS techniques that can predict the exact point providing the coordinates (e.g. Longitute/Latitute) of possible knickpoints. Thedata that the user has to supply to the system is a good scale relief and the drainage system of the area.

Coastal zone of the Ithaki Island consists mainly of calcareous rocks (>80%) of the Ionian geotectonic zone and secondarily of Neogene sequences, flysch and Quaternary deposits. Due to the presence of carstic limestones, vegetation is poor with the ‘makia’ type of vegetation to cover almost the half of the coastal land. In terms of coast formation, four types of coasts have been identified, according toShepard’s genetic classification; these are coasts of: tectonic origin, terrestrial deposition, subaerial erosion and marine erosion. The small coastal towns and villages occupy only the 3,1% of the coastal land being developed primarily on Quaternary deposits and in areas with small (10%) topographic slope. Beaches suitable for touristic activities are present within protected small bays and usually are associated with the presence of fluvial deposits reworked by the existed wave activity.