1. The region between the Antarctic Polar Front and the Continental Water Boundary. 2. Geographically, the region between the Antarctic Circle (66°32′S) and the South Pole. Climatically, the limit of the zone may be set at about 60°S, poleward of which the prevailing westerly winds give place to easterly or variable winds. Over most of this region the average temperature does not rise above 0°C (32°F) even in summer.