Geologists have uncovered compelling new evidence that reshapes the understanding of Hells Canyon, America’s deepest river gorge. In a recent study, researchers revealed that this dramatic geological ...

The canyon dips to its deepest point along this stretch, reaching 19,715 feet (6,009 m) from top to bottom, or three times as ...

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon. Matthew Morriss hide caption ...

The Grand Canyon is not the world's deepest canyon. Let’s clear up this misconception right off the bat. ... with parts of it dating back as many as 70 million years, ...

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, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

Although the ancient layers of granite in the deepest part of the canyon are 1.7 billion years old, scientists agree that the gorge itself is nowhere near that age.

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

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 ...