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.
List of Hudson Bay rivers
This list of Hudson Bay rivers includes the principal rivers draining into the Hudson, James and Ungava bays of the Arctic Ocean. The total surface area of the Hudson Bay watershed is about , with a mean discharge of about . The drainage basin includes parts of five Canadian provinces (Alberta, Saskatchewan, Manitoba, Ontario and Quebec), territories (Northwest Territories and Nunavut) and four American states (Montana, South Dakota, North Dakota and Minnesota). The two principal waterways are the La Grande Rivière, in Québec, and the Nelson River in Manitoba, each with an average waterflow of over .