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People automatically think it is the St. Lawrence River, but in fact the longest river in Canada is MacKenzie River in NWT. It begins at the Great Slave lake and is 1800 KM (1118 miles) long.

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15y ago
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13y ago

The Mackenzie River is the longest river in Canada at 4,241 km.

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Q: What is the longest river in Canada and how long is it?
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