Everything’s bigger in the US, they say, and that apparently includes its river gorges. But don't be fooled by its grand size ...

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

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

Hells Canyon, which is on the border between Oregon and Idaho, is almost 8,000 feet deep ... cave is about 1,200 feet above the modern-day Snake River. Eventually, by exploring over 30 caves ...

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 ... high above today's Snake River.