Ancient Canyon Discovered Under a River in Tibet : DNews — news.discovery.com

We think of canyons as being carved by rivers, as the Colorado River did with the Grand Canyon, so this item is a little mind-boggling. In a just-published article in the journal Science, researchers from the California Institute of Technology have discovered an vast ancient canyon that lies buried underneath a present-day river that cuts through the Himalayas in Tibet. The ancient canyon is thousands of feet deep in places, and apparently was carved by a previous river 3 to 7 million years ago.

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