Setting off by canoe from his Canadian outpost, Mackenzie eventually happened upon not the Pacific, but the Arctic Ocean. Upon this unfortunate discovery, it is rumoured that Mackenzie initially named the river system the "Disappointment River," though this has never been verified by historians.
The Mackenzie River, named after the Scot, is the second longest river system in North America, behind only the Mississippi.
You can find out more about Alexander Mackenzie here.
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