Valleys

[Kamil]

What's the difference between :

- gully ,
- ravine ,
- gorge ,
- defile ,
- kloof ?

I know the words mean kinds of valleys .
And that's all I know .
Do they represent the same kinds of valleys ?

Thanx in advance

[xeo]

gully- a long narrow valley with steep sides
ravine - the same but VERY DEEP and narrow
gorge - a deep valley with high straight sides where a river has cut through rock
defile - a gorge or a narrow passage

greetings