Formation of gorges Gorges are deep ,narrow and steep sided river valleys. They are mostly formed when the process of forming a waterfall is repeated frequently, as the waterfall retreats upstream.
Gorges are also formed where: -a river flows along a line of weakness. -a river maintains its course across a landscape which is slowly being uplifted. -a river cuts across a plateau composed of horizontal and alternate layers of hard and soft rocks.
Example of a gorgeVerdon gorge in France;
Since there is a risk of flooding on these gorges, some countries, like CHINA, have used this to their advantage; -the three gorges dam project was established to control flood, provide hydroelectric power and navigation.
(source of information: sfakia-crete.com, Wikipedia, mtholyoke)