I have a lake map layer that mistook algae for land and now some of my lakes have a a lot of hole in them and I don't want these holes. I also don't want to delete Islands and I have a lot of lakes.
According to this help document:
- Click the Edit tool on the Editor toolbar and double-click the feature you want to edit.
- Right-click the part you want to delete, point to Part, then click Delete.
- Right-click anywhere on the map and click Finish Sketch.
You could edit the vertices of the polygon, then delete all vertices of the holes.
You can use Union and then make sure the "Gaps Allowed (Optional)" check box is unchecked.
This will fill in any instances of 'holes' within a polygon layer.