Hells Canyon might be deeper than the Grand Canyon, but it's barely 2 million years old, according to a new study.

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

Hells Canyon, the deepest river gorge in the United States ... a geoscientist at Purdue University who wasn't part of the research team. Sponsor Message "They had the persistence to find the ...