Hi Glassman, You are correct that most openings would be classed as natural=bare_rock, I guess I didn't want to start mapping rock until I was ready to start mapping all the rock on the island (ie outside of the natural=wood). I see that I created the areas when I was just trying to make holes in the natural=wood. I have removed the areas just to leave the holes. Creating inner polygons is something I am just learning how to do. Thanks for the tip!