I want to create a new vector layer which represents the surrounding water of a particular island I am working with in QGIS. Is it possible to create a water shape based on an "inverted selection" or the empty areas of an existing vector layer?
As @jdavid05 mentions, I do need to create another vector. The question is still a duplicate, though, as I think the following method here applies: Create a new vector layer that fills space between other polygons in QGIS