Grand Canyon got its name because it is one of the biggest canyons in the world.
It could be called a gorge.
Valley
They are called "Cañones". There are two in Mexico: The Cañon del Sumidero in the state of Chiapas and the Cañon del Cobre in the state of Chihuahua. The Cañon del Cobre is bigger, deeper and in...
Valles Marineris is about 4000 km long, 200 km wide, and 7 km deep.