Antarctica and Greenland are the only places on earth where we today see ice sheets. Maybe you know Antarctica as the South Pole, but the South Pole is merely a point almost at the centre of Antarctica.
The earth seen from directly above the North Pole (left) and directly above the South Pole (right). It is clear that the Antarctic ice sheet is much larger than the Greenland ice sheet.
Antarctica is not merely an island, as Greenland, but an entire continent. The area of the Antarctic ice sheet is 14 million km2, which is eight times larger than the Greenland ice sheet.