Knocking sound on front fender

[Rolling Stone]

hi guys
In have been riding this bike now for almost 5 years with an awful knocking sound coming from what I think is the front fender.
As soon as I hit  a bit of rough stuff clok clok clok sound from the front
I can not find or solve the issue
Any advice, where to look, what to do?

 

[Welsh]

 

[Fudmucker]

 

[Rolling Stone]

 

[Parkinoff]

 

[Rolling Stone]

 

[BiG DoM]

 

[Parkinoff]

 

[JacoM]

 

[BiG DoM]

 

[BiG DoM]

 

[Parkinoff]

 

[Rolling Stone]

 

[Welsh]

 

[Adventure rider for life!]