of W. long.) to the
Ungava Peninsula, which abuts on Labrador. Where this vast region
slopes to the Arctic Ocean and Hudson's Bay it is rather low and flat,
except between Alaska and the Mackenzie River, and between the
Mackenzie and the watershed of Hudson's Bay. The principal river
system in the far North-West is that of the great Mackenzie River,
which flows into the Arctic Ocean (Beaufort Sea) through an immense
delta, and is one of the longest rivers in the world. The southernmost
sources of the Mackenzie (such as the Peace River and the Athabaska
River) rise in the Rocky Mountains to the east of British Columbia.
These waters are stored for a time in Lake Athabaska, and then under
the name of Slave River flow northwards into the Great Slave Lake, and
out of this, under the name of Mackenzie River, into Beaufort Sea,
through an immense delta. The Great Bear Lake is also a feeder of the
Mackenzie.
Two other Arctic rivers at one time thought to be of great importance
as means of communication with the Arctic Ocean, are the Great Fish
River, which flows into Elliot Bay, and the Coppermine River, which
enters Coronation Gulf. The other northward-flowing rivers (passing
through innumerable lakes and lakelets) enter Hudson's Bay.
West of the great Mackenzie River rises the northernmost extension of
the Rocky Mountains.
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