The Clue to the Location
This is the location where Ruby's Mother told her to go to this place if she ever got separated from them. It would be their safe place. Later, Ruby goes back here during the Flying Rocks of Many Nights to make sure her family is safe. It is located in the Mysterious Beyond.
Hanging Rock appears in the twenty - second episode of the TV show episode "Return to Hanging Rock" which Ruby can see her parents up there if getting separated from them as their safe place ( meaning the rock) which she goes back here during the Flying Rocks of Many Nights to make sure her family is safe.
They go back to the Great Valley because of two Sharpteeth like Red Claw are coming through the Mysterious Beyond because Ruby can be heard singing a song which the end part of it was cut off because of the spotted Sharpteeth were coming to Hanging Rock.