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Earth Matters

November Puzzler Answer: The Mackenzie River

December 11th, 2015 by Kathryn Hansen


The November 2015 puzzler turned out to perplex many of our readers. That’s no surprise; the scene shows less than 20 kilometers of Canada’s longest river—the Mackenzie.

The Mackenzie River flows for more than 4,000 kilometers, and drains a basin that spans one-fifth of Canada’s total land area. Each year, the Mackenzie delivers about 325 cubic kilometers of fresh water to the Arctic Ocean.

Clues to the image’s location show up as flecks of white, which are floating bits of ice. The ice came from the Great Slave Lake, east of this image, where the river gets its start. This image was acquired with the Operational Land Imager (OLI) on Landsat 8 on May 13, 2015, around the beginning of the annual spring melt. A wider view of the area, including the lake, was featured as our Image of the Day on November 28, 2015.

Congratulations to Irene Marzolff, the first to post a correct answer to the blog. Not only did she deduce the correct location, she specified that it was acquired with the Landsat 8 satellite sometime during the melt season. On Facebook, Georg Pointner was the first to correctly name the river and note its location near Great Slave Lake.

Click here to see the river’s other extremity, at the Mackenzie River Delta. This is where the river empties into the Arctic Ocean via the Beaufort Sea.

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