Q. Which is the longest river system in Canada?
Answer: Mackenzie River
Notes: The Mackenzie River is the longest river system in Canada. It is also the largest river flowing into the Arctic Ocean from North America, and it includes the second largest drainage basin of North American River.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 46 in Physical Geography - Important Rivers, River Islands, Deltas and Lakes in above course in App.