Because, drainage basins are high elevated
The Boreal Shield stretches from Alberta to Newfoundland, as it is known as Canada's largest terrestrial ecozones. The bulk of the Boreal Shield stands in Quèbec and Ontario.
Boreal Shield
Oceans themselves are not drainage basins; rather, they are large bodies of saltwater that receive water from various drainage basins. A drainage basin, or watershed, is an area of land where all precipitation collects and drains into a common outlet, such as a river, lake, or ocean. In this context, rivers and streams within drainage basins ultimately carry water to oceans, making the oceans the final destination for the water collected in these basins.
yes
Because, drainage basins are high elevated
Drainage basins are separated from each other by an area of higher ground called a drainage divide. North America has 5 large Continental Divides that separate the drainage basins of the Pacific, Arctic, and Atlantic Oceans, Hudson Bay, the Great Lakes, and the Gulf of Mexico.
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The Boreal shield.
a drainage divide
Drainage basins are separated from each other by an area of higher ground called a divide. This divide helps to direct water within a specific drainage basin, preventing water from flowing into neighboring basins.
Drainage Basin