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How long is the Mackenzie River?

  1. 3,200 kilometres

  2. 4,200 kilometres

  3. 5,200 kilometres

  4. 6,200 kilometres

The correct answer is: 4,200 kilometres

The Mackenzie River is Canada's longest river, spanning 4,200 kilometres from Great Slave Lake in the Northwest Territories to the Beaufort Sea in the Arctic Ocean. Option A may seem like a credible answer, as it is the length of another major river, the Mississippi, but the Mackenzie actually exceeds this distance. Options C and D are both significantly longer than the actual length of the Mackenzie River, making them incorrect. Overall, it is important to pay attention to specific details and geographical context when answering this question.