How to remove outlying islands from a DEM raster?

المشرف العام

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I have a raster image that looks like this (see below)



How do I remove the outlying islands and keep only the central main island in the image. Is it a geoprocessing clip function?I am using QGIS 2.8.1, I added a .tif file from a downloaded DEM and then used the raster>analysis>DEM(terrain models)



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