1. Canada: Canada has the largest land area within the Arctic Circle, with vast stretches of tundra and ice.
2. Russia: Russia also boasts a large portion of land within the Arctic Circle, including Siberia.
3. United States (Alaska): Alaska, a state of the United States, is located in the Arctic and has a significant portion of its territory within the polar zone.
4. Greenland: While a self-governing territory of Denmark, Greenland is almost entirely within the Arctic Circle and is known for its massive ice sheet.
5. Norway: Norway has a significant portion of its territory within the Arctic Circle, including the Svalbard archipelago.
It's worth noting that the "polar zone" is generally defined as the areas within the Arctic Circle (66.5° N) and Antarctic Circle (66.5° S). Many countries have portions of territory within these circles, but the five listed above have significant portions within the polar zones.
