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.
Geography of Canada
The continental divide in the Rockies separates the Pacific watershed in British Columbia and Yukon from the Arctic and Hudson Bay watersheds. This watershed irrigates the agriculturally important areas of inner British Columbia (such as the Okanagan and Kootenay valleys), and is used to produce hydroelectricity. Major elements are the Yukon, Columbia and Fraser rivers.