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'Grand Canyon of Greenland' discovered under ice sheet

 You think that everything that could be known about the land surface is known, but it's not," said Jonathan Bamber, lead study author and a geographer at the University of Bristol in the United Kingdom. "There's still so much to learn about the planet."

The great gorge meanders northward from Summit, the highest point in central Greenland, toward Petermann Glacier on the northwest coast, covering more than 460 miles (750 kilometers). Researchers think the ravine could be even longer, but they don't yet have the data to prove where the canyon peters out deep under the interior ice sheet. "It may actually go farther south," Bamber told LiveScience's OurAmazingPlanet.

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