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.
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.
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.