Antarctica is not a country, it's the Earth's southernmost continent, containing the geographic South Pole. this is just a symbol of Antarctic Treaty. The Antarctica is a free land and no countries claim of this place, there are about 5.000 people live on this place, but most of them are only a scientists and adventure travelers.
I also collect huge pictures of country flags on this site, feel free to browse several of them by visiting below gallery:
Country Flags Wallpaper
Flags of the World in High Resolution of Antarctica treaty Flag