Gorges are deep, steep valleys formed by waterfalls cutting upstream over time. They occur where rivers flow along weaknesses in the landscape or cut across plateaus of alternating hard and soft rock layers. The Three Gorges Dam in China was constructed in the Yangtze River gorge to control floods, generate hydroelectric power, and enable navigation.

2. 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.

3.  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.


4. Example of a gorge
Verdon gorge in France;

5. 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.

6. (source of information: sfakia-crete.com, Wikipedia,
mtholyoke)