The definitive boundary of the Arctic is often cited as the area North of the Arctic Circle (66° 33’N), but the socio-political definition sets the boundary as the region where the average temperature for the warmest month (July) is below 10 °C (50 °F); the northernmost tree line roughly follows the isotherm at the boundary of this region.
In the former definition, Antarctica is larger in terms of square mileage. In the latter definition, the Arctic is larger.
Antarctica has a total square mileage of 14 million sq km (869,000 square miles). 280,000 of those km are ice-less and 13.72 are covered in ice. The Arctic in its entirety is about 1.63 square miles of ice.
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