The main objective of this work is to characterize the hydrlgrafic basins of Cay Guam and Quesigua from the tectonic point of view. Parallel to this work, aerial photographic interpretation was carried out in order to identify the existing alignment and disjunctive structures. Preliminary information and field data were processed and interpreted; based on which diagrams, maps, graphics and tables were generated to allow the characterization of the hydrographic basins applying image processing and geologic mapping techniques.