Northern Circumpolar RegionDataset includes the following layers: international boundaries, provincial and territorial boundaries, national capital cities, other cities, towns, villages, hamlets, several seasonally populated places, median sea ice extent from September 1981 to 2010, the tree line, undersea relief, land relief, glaciers, ice fields and coastal ice shelves. The dataset uses the azimuthal equidistant projection and is available in Geodatabase format and MXD format.