Hanging Rock is a geological formation located north-west of Melbourne in Australia. It is a mamelon, which is a rock formation created by eruption of relatively thick or stiff lava through a narrow vent in the bedrock, which results in a small mound around the vent. Successive eruptions forms a number of layers to create these unique formations.
Hanging Rock is also famous for being the location in the Australian novel and film, Picnic at Hanging Rock. In this story, a group of school girls mysteriously disappear while on a trip in Hanging Rock.