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gorge

canyon - Click to enlarge
Cheddar Gorge in the Mendip Hills - Click to enlarge
Cheddar Gorge, Mendip Hills - Click to enlarge
Gap of Dunloe, Killarny - Click to enlarge
glacial activity - Click to enlarge
waterfall - Click to enlarge
Click images to enlarge

Narrow steep-sided valley or canyon that may or may not have a river at the bottom. A gorge may be formed as a waterfall retreats upstream, eroding away the rock at the base of a river valley; or it may be caused by rejuvenation, when a river begins to cut downwards into its channel for some reason – for example, in response to a fall in sea level. Gorges are common in limestone country (see karst), where they may be formed by the collapse of the roofs of underground caverns.

© RM 2010. Helicon Publishing is division of RM.


 
 

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