The north polar regions lie within the Arctic circle, and at their center is the North Pole. The distance from the circle to the pole is more than fourteen hundred miles. Intense cold and the hardships of ice navigation have made the discovery and exploration of this region very slow and hazardous.
It is believed that Norsemen from Norway and Sweden, after colonizing Iceland, made settlements on the Greenland coast and carried their seal hunting beyond the Arctic circle, far into the polar regions. But in 1347 a plague broke out in Norway, and the people forgot their far-off colonies. For more than a hundred years after this no attempt was made to enter the Arctic circle.
It is a singular fact that the famous voyage of Columbus in 1492, although made toward the south, should have influenced to some extent discovery in the north polar regions. After Columbus had really proved that the earth was round, navigators believed that by sailing westward far enough they might reach the rich lands of India and Cathay (China).