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I am trying to generate a catchment area polygon from a digital elevation model. I am using SAGA tools in QGIS and used the Flow Accumulation (Flow Tracing) tool to generate a catchment area raster that clearly shows all of the channels (See image) Catchment area raster generated by SAGA flow accumulation

From here, how could I generate a catchment boundary polygon of the main catchment (middle of the raster)? Is there a tool in SAGA that could do this?

I am new user of QGIS and do not have technical expertise of GIS.

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Try the SAGA module "Watershed basins"

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