360° Antarctic Ice Wall Perimeter Basin / Container Of Earth

Antarctica is a 360° 49,728-mile-long ice wall perimeter basin/container of our known Earth plain and its oceans. True circumnavigation of the Earth would be sailing or flying along the Antarctic ice wall, starting from one notable point and retuning exactly there. You may even stumble upon an opening if you were allowed to attempt the circumnavigation without being shot down by military defenses as per the Antarctic Treaty.