Lines depict the Northern Sea Route, Northwest Passate, and
hypothetical Transpolar Route.

=== Original Data Source ===
Arctic Sea Routes

Arctic lines of general transportation. In the case of the
Northern Sea Route, the route is based on the actual route used by
Russian icebreakers and cargo ships. The Northwest Passage is based
on the channels that would be able to support large cargo ships. The
transpolar route is a hypothetical route that could be used either
as a result of ice-free summers or the extensive use of icebreakers
and ice-hardened ships.

Citation:
National Geospatial-Intelligence Agency (NGA)

Citation URL:
https://arctic-nga.opendata.arcgis.com/datasets/67760a7f85614902ac19fa6ff643b9fa_0