This video tutorial guides viewers on how to delineate a catchment area using QGIS, a free and opensource geographic information system software. The tutorial covers the process of identifying the catchment area's outlet point, creating a flow direction raster, and generating a channel network and catchment area polygon using the SAGA GIS tool. The tutorial is easy to follow and suitable for users of all levels, making it an essential resource for anyone looking to identify and analyze catchment areas in their GIS projects.