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Entertaining retelling of a kayakers trip down the Niagara Gorge. If you are unfamiliar with the Niagara River Gorge, it is home to Class 6 Rapids, which are the highest rated rapids possible.
Very impressive if you have ever been to the Gorge and seen the water that rips through there. Here's some photos of the Gorge to put it in perspective.
http://www.edto.net/pg-whirlpoolrapids/