Gorge, Fjord, or Canyon

A narrow valley between hills or mountains, typically with steep rocky walls and a stream running through it.

A deep gorge, typically one with a river flowing through it.

A long, narrow, deep inlet of the sea between high cliffs, as in Norway and Iceland, typically formed by submergence of a glaciated valley.

There is only one Fjord in the United States.

The term gorge comes from the French word for throat or neck.

The Grand Canyon is the worlds deepest canyon