Gates of the Arctic National Park and Preserve is an American national park that protects portions of the Brooks Range in northern Alaska.The park is the northernmost national park in the United States, situated entirely north of the Arctic Circle.The park is the second largest in the U.S. at 8,472,506 acres (13,238 sq mi; 34,287 km 2), slightly larger in area than Belgium.

A polar circle is a geographic term for a conditional circular line (arc) referring either to the Arctic Circle or the Antarctic Circle.These are two of the keynote circles of latitude (parallels). On Earth, the Arctic Circle is currently drifting northwards at a speed of about 14.5 m per year and is now at a mean latitude (i.e. without taking into account the astronomical nutation) of 66°33 ...