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The flyover to Herschel Island over the Mackenzie Delta is one of the most memorable experiences of my life. Crossing over taiga to tundra, the biggest river discharging into the Arctic Ocean produced a myriad of fluvial and thermokarst landforms. Herschel Island itself is in the continuous permafrost zone. It is composed of ice-rich permafrost, thus huge thermoerosional landforms called retrogressive thaw slumps occur.