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.
Eastern forest-boreal transition
The ecoregion includes most of the southern Canadian Shield in Ontario and Quebec north and west of the Saint Lawrence River lowlands including the eastern shores of Lake Superior and other areas of the Great Lakes, Lake Timiskaming, the southern Laurentian Mountains, Lake Nipissing, Quebec City, the Saguenay River and parts of Georgian Bay, Greater Sudbury/North Bay, Ontario, Saguenay, Quebec, the Clay Belt and Temagami in Ontario. There is a separate section of the ecoregion in the Adirondack Mountains in upper New York State, United States. However the higher elevations of the Laurentian Mountains and the northern Appalachian Mountains in Canada constitute the Eastern Canadian forests ecoregion.