-- Disappointment River In this book, Brian Castner not only retells the story of Mackenzie's epic voyages in vivid prose, he personally retraces his travels in an 1,125-mile canoe voyage down the river that bears his name, battling exhaustion, exposure, mosquitoes, white water rapids and the threat of bears. He transports readers to a world rarely glimpsed in the media, of tar sands, thawing permafrost, remote indigenous villages and, at the end, a wide open Arctic Ocean that has the potential of becoming a far-northern Mississippi of barges and pipelines and oil money.