The King's Trough Complex is a several-hundred-kilometer-long, canyon-like system of trenches on the North Atlantic seafloor.

Scientists are learning more about how water moves through the Grand Canyon, and how what happens above ground affects what ...

Mysterious driftwood high in Grand Canyon caves hints at the legacy of Arizona’s huge impact crater.

Marble Canyon is is not only a geographic marvel — a ribbon of red rock carved by time and water — it’s also a timeless space where silent communion with sky and stone make more sense than catching up ...

Authorities closed the North Rim last year as the Dragon Bravo Fire burned about 145,000 acres.

Add Yahoo as a preferred source to see more of our stories on Google. The Tanner Trail on the Escalante Route through the mighty Grand Canyon, leads down to the banks of the Colorado River. Photograph ...