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AbstractA drainage basin is an area that drains all precipitation
received as a runoff or base flow (groundwater sources) into a particular river
or set of rivers. Canada’s major drainage regions are the Atlantic
Ocean, Hudson Bay, Arctic Ocean, Pacific Ocean, and Gulf of Mexico. A lake can
be defined as any inland body of water, usually fresh water, larger than a pool
or pond. Canada is covered by as many as two million lakes. The largest set
of lakes, the Great Lakes, straddle the Canada-US boundary and contain 18% of
the world’s fresh water in lakes. Most Canadian rivers have developed
since the last ice age. Almost 75% of the Canadian landmass contains water that
drains northward into either the Arctic Ocean or into Hudson and James bays.
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