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 lakes of Alberta
As with other basins on the planet, the topographical highlights in the drainage divides between these basins can be difficult to discern. For example, there is little elevation change in the short of land between Lac la Biche and Beaver Lake, yet the former is in a watershed that drains north into the Arctic Ocean, while the latter is in a watershed that drains east into Hudson Bay.