Try to find pictures of canyons on the web. Basically a canyon is a steep-sided valley. The word is used principally in North America.
The Colorado River forms the Grand Canyon
The name of the Grand Canyon's river is the Colorado River.
No, the Grand Canyon is west of the Mississippi river.
The Colorado River runs through the Grand Canyon
Black canyon
The Grand Canyon.
The Colorado river runs through the grand canyon
The river which flows through the Grand Canyon is the Colorado river.
The Colorado River flows through the grand canyon.
The Colorado River formed the Grand Canyon.
Hassayampa River Canyon Wilderness was created in 1990.
Salt River Canyon Wilderness was created in 1984.