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Defining the Arctic

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Click on these three maps to see the different ways the Arctic can be defined.

1. The Arctic Circle is an imaginary line around the Earth (at about 66°33' North Latitude) that defines the boundary of the Arctic. It marks the start of the area where, for at least one day each year, the sun does not completely set (June 21) or rise (December 22).

Last updated: September 28, 2010

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