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 river basins in the United States
These are the major U.S. river basins in the U.S., as designated by the U.S. Water Resources Council. Each of these river basins contain a number of smaller river basins.