The area around the North Pole. The Arctic encompasses the Arctic Ocean and parts of Canada, Russia, Alaska, Greenland, Iceland and Norway. The island of Svalbard is also part of the Arctic. The Arctic is not a precisely defined area. The term is often used to refer to any area north of the tree line. Some use the Arctic Circle – a line of latitude at 66°33' N – as the defining line. Another definition also used is the area north of the 10-degree summer isotherm. An isotherm is a line marking areas with similar temperatures.
The northern polar region of the Earth which includes almost the whole area of the Arctic ocean and adjacent areas of Eurasian and North American continents. Technically the term "Canadian Arctic" covers the part of Canada that is north of the Arctic Circle, but we often use the term to describe everything north of the tree line.
The Arctic is the area around the Earth's North Pole, opposite the Antarctican area around the South Pole. The Arctic includes parts of Canada, Greenland (a territory of Denmark), Russia, United States (Alaska), Iceland, Norway, Sweden and Finland, as well as the Arctic Ocean.