Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin. This page is about the process of identifying the boundaries of a watershed, or drainage basin, on the Earth's surface.įor watershed segmentation, a technique for image processing, see Watershed (image processing).Īlso not to be confused with wetland delineation, the process of identifying the location and boundaries of a wetland, an area that is flooded or saturated with water.