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Arctic, the

Introduction

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°C (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.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.