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. Image: Matthew Morriss/ ...

Research Grand Canyon landslide-dam and paleolake triggered by the Meteor Crater impact at 56 ka by a team from the University of New Mexico describes a lake in the Grand Canyon created by a ...

Hells Canyon, which is on the border between Oregon and Idaho, is almost 8,000 feet deep. That makes it far deeper than the famous Grand Canyon of Arizona, which reaches a depth of about 6,000 feet ...