Ottawa River drainage basin
The Ottawa River drainage basin is the drainage basin in northern North America where surface water empties into the Ottawa River and adjoining waters. Spanning an area of about , it is the 12th largest drainage basin in Canada, occupying the Canadian provinces of Ontario and Quebec. It accounts for about 11% of the total Saint Lawrence River drainage area.
Hudson Bay
Hudson Bay (Inuktitut: "Kangiqsualuk ilua", ) (sometimes called Hudson's Bay, usually historically) is a large body of saltwater in northeastern Canada with a surface area of . It drains a very large area, about , that includes parts of southeastern Nunavut, Saskatchewan, most of Manitoba, Ontario, Quebec and indirectly through smaller passages of water to parts of North Dakota, South Dakota, Minnesota, and Montana. Hudson Bay's southern arm is called James Bay.