ARCTIC REGIONS, the term applied to the regions round the North Pole, covering the area (both ocean and lands) where the characteristic polar conditions of climate, etc., obtain. The Arctic circle is drawn at 66° 30' N., but this has no geographical value as a boundary. A more satisfactory delimitation is the area north of the limit of tree growth. This embraces in addition to Greenland, Spitsbergen and other polar islands, the northern parts of the mainlands of Siberia, Alaska and Canada, the coasts of Labrador, the north of Iceland and a strip of the Arctic coast of Europe but the last, on other grounds, should be excluded.