A deep valley bounded by steep and rocky walls is called __________.
Gorge
A gorge is a deep and narrow valley whose sides are very steep and rocky.
It is formed mainly by vertical (downward) erosion, when a river keeps cutting through hard rock over a long period of time.
Gorges are typical of the youthful stage of a river, where down-cutting is far stronger than sideways erosion; an exceptionally deep and wide gorge is called a canyon.
Hence, Gorge.
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