Thanks, John, for the above two pictures!!
Hanging Rock is, indeed, a real place.
The view of the rock itself, and the view from the rock are both quite beautiful.
My You Tube Video for Picnic at Hanging Rock
A review of the movie by Tony Whitaker is here
Sandra from Germany has her new picnic site here.
Note: the information on this page is the most correct I have been able to come up with. In some of the materials below the information stated might differ from this page but this is the page that should be considered as the most accurate.