Related: These clues suggest that Hells Canyon formed when water diverted from Lake Idaho into the current route of the gorge to form what's now the Snake River. The lake may have spilled over ...

Credit: X-Weinzar, CC BY-SA 2.5 North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new addition to the Earth's ancient landscape.

However, unlike its national park counterpart that dates back at least 6 million years, Hells Canyon was sculpted rapidly just 2.1 million years ago, when a sudden landscape shift and melting ...

Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing.

Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing.

Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing. That's ...