Topography (Geography)
While the largest part of the Arctic is composed of permanent ice and tundra north of the tree line, it encompasses geological regions of varying types: the Innuitian Mountains, associated with the Arctic Cordillera mountain system, is geologically distinct from the Arctic Region (which consists largely of lowlands). The Arctic and Hudson Bay Lowlands comprise a substantial part of the geographic region often considered part of the Canadian Shield (in contrast to the sole geological area). The ground in the Arctic is mostly composed of permafrost, making construction difficult and often hazardous, and agriculture virtually impossible.
The Arctic watershed (or drainage basin) drains northern parts of Manitoba, Alberta and British Columbia, most of the Northwest Territories and Nunavut as well as parts of Yukon into the Arctic Ocean, including the Beaufort Sea and Baffin Bay. With the exception of the Mackenzie River, Canada's longest river, this watershed has been little used for hydroelectricity. The Peace and Athabasca Rivers along with Great Bear and Great Slave Lake (respectively the largest and second largest lakes wholly enclosed within Canada), are significant elements of the Arctic watershed. Each of these elements eventually merges with the Mackenzie so that it thereby drains the vast majority of the Arctic watershed.
Read more about this topic: Northern Canada
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