The Alsek River is famous for many things including flowing through the largest non-polar ice cap in the world. The river is over 3 kilometers wide in some places but the width of the Alsek is reduced by 90% in Turnback Canyon. The famous Turnback Canyon which is a 7 kilometer long Class V+ section of water that we portaged around by helicopter.
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Note: Travel films and more available on my KZfaq channel ( / @tletter .