My Prefix can be a line
But I am more known as a kind of formation
My Infix is a very great waterfall
Tourists usually take picture of it
A great channel my Suffix is
It may just be one of the best
My whole is a very famous person
Note :
Title is also a hint
Hint :
That person received many awards for what he/she made
Hint 2 :
EDIT : A specific number can be related to this Riley Riddle
Hint 3 :
The specific number is 7
Hint 4 :
The name of the waterfall consists of just 3 letters