Arctic, the, Arctic Physical Geography

Related Category: Arctic Physical Geography

Arctic, the northernmost area of the earth, centered on the North Pole. The arctic regions are not coextensive with the area enclosed by the Arctic Circle (lat. 66°30´N) but are usually defined by the irregular and shifting 50°F (10°C) July isotherm that closely corresponds to the northern limit of tree growth and that varies both N and S of the Arctic Circle. The regions therefore include the Arctic Ocean; the northern reaches of Canada, Alaska, Russia, Norway, and the Atlantic Ocean; Svalbard; most of Iceland; Greenland; and the Bering Sea.