On the reverse is a political map of the Arctic Sea and the North Circumpolar Region from Natural Resources Canada, the country’s topographic survey organization. The map covers an area north of 55º of latitude, with countries presented in different colours against the surrounding seas which have bathymetric colouring. Relief shading shows the terrain on land and the sea bed, where ridges and basin are named. Glaciated areas are indicated and the map shows both the limit of permanent polar sea ice (from 1972 to 2007) and the tree line on land. Latitude lines are drawn at intervals of 5º, with longitude at 10º.
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