A picture of a possible shield for Antarctica Routes using the flag of the continent. Based on en:Image:US 1.svg in conjunction with http://www.photolib.noaa.gov/bigs/corp1521.jpg. Public domain.
Originally from en.wikipedia; description page is/was here.
Original uploader was Gooday.1 at en.wikipediaLater versions were uploaded by TwinsMetsFan at en.wikipedia.