Grand Canyon Caverns and restaurant have opened after being closed for nearly 3 years. Here's why it closed and how to go ...

Geologists have uncovered compelling new evidence that reshapes the understanding of Hells Canyon, America’s deepest river ...

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million ...

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. A recent study suggests that a ...

Hells Canyon Wilderness is part of the Hells Canyon National Recreation Area, which straddles the border between northeastern Oregon and western Idaho. BLM via Flickr CC 2.0 But dating canyons is ...

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 is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed. Hells Canyon, the deepest river gorge in the United States, likely got ...

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.