Prelims ask
Great Lakes, northeast, Atlantic estuary, Canada–USA.
North America
St Lawrence
Not a world-length contender as a river alone. Its rank is as a lake-and-estuary system.
- Source
- Outflow of Lake Ontario. The system includes the Great Lakes.
- Countries
- Canada and the United States. The river itself is mainly Canadian and forms the border on the upper reach.
- Direction
- Northeast.
- Mouth
- Gulf of St Lawrence, Atlantic Ocean.
- Length
- About 1,200 km for the river proper. The seaway system is far longer.
- Major tributaries
- Ottawa, Richelieu, Saguenay.
- Delta or estuary
- One of the world’s large estuaries.
- Basin
- Great Lakes–St Lawrence Seaway. International.
- One exam fact
- Drains the interior lakes east to the Atlantic, not south to the Gulf of Mexico.
Mains use
A boundary and navigation system where the ‘river’ is the outlet of a lake chain.