While towering mountains and canyon walls seem abundant in the Grand Canyon State, many may not realize that there’s an ...

It's a brilliant November morning in the heart of the Grand Canyon, and the ribbon of cold, clear sky framed by mile-high walls is growing bluer by the minute. A gentle breeze moves upstream along the ...

The origin story of Hells Canyon, North America's deepest river gorge, has long been unclear to scientists. But new research estimates it formed about 2.1 million years ago when a dramatic flood event ...