Watching the golf today, it looks like portions of the perimeter of a number of greens have mounding that, in some cases, collects a shot that may be rolling wide or long of the green and propels the ball back down the slope of the mounding and on to the green surface.
I have never seen the course in person. Anyone who knows better is welcome to let me know if what I am seeing is correct or mistaken.
Assuming the mounding I think is there really is there, my question is how much of it is natural vs. man-made?