Prelims ask
Canada, north, Beaufort Sea, Great Slave Lake.
North America
Mackenzie
Longest river system in Canada.
- Source
- The river leaves Great Slave Lake. The farthest headwater is the Finlay–Peace, through the Slave.
- Countries
- Canada.
- Direction
- North.
- Mouth
- Beaufort Sea, Arctic Ocean.
- Length
- About 4,240 km with the Peace–Slave headwater.
- Major tributaries
- Liard and Peel. Great Bear Lake drains in through the Great Bear River.
- Delta or estuary
- Delta.
- Basin
- Second-largest basin in North America, after the Mississippi. Permafrost lowland.
- One exam fact
- Arctic mouth. Not a Pacific river and not the St Lawrence.
Mains use
Arctic-bound drainage of a shield-and-plain basin. Pair with the Siberian rivers.