What is the only continent crossed by all lines of longitude?

Antarctica is the only continent crossed by all lines of longitude. Every meridian runs from the North Pole to the South Pole, so all of them meet at Antarctica’s geographic South Pole. This makes the continent uniquely connected to every longitude, although no ordinary time zone covers it uniformly.

Antarctica surrounds the South Pole and is almost entirely covered by the Antarctic Ice Sheet, which contains the largest single mass of ice on Earth. The continent is also the coldest, driest, and windiest continent. Its ice holds roughly 90 percent of the world’s surface fresh water by volume, though that water is frozen.

The geographic South Pole lies at 90° south latitude, while the magnetic and geomagnetic poles are different locations and move over time. Antarctica has no permanent native population and no sovereign government. Its activities are regulated internationally through the Antarctic Treaty System, beginning with the 1959 Antarctic Treaty, which reserves the region for peaceful purposes and scientific cooperation.