This tutorial will describe the shortest & easiest method to delineate watershed in QGIS. You just need a DEM (Digital Elevation Model) of desired area and a reference base map like Google map of Google Earth Images Tutorial to download SRTM DEM in QGIS through SRTM Downloader plugin • Download SRTM DEM in QGIS Tutorial to add Google Images and Maps in QGIS through HCMGIS plugin • Google Earth Images in QGIS