Hanging Rock (also known as Mount Diogenes, Dryden's Rock, and to some of its traditional owners as Ngannelong) is a distinctive geological formation in central Victoria, Australia. A former volcano, it lies 718m above sea level (105m above plain level) on the plain between the two small townships of Newham and Hesket, approximately 70 km north-west of Melbourne and a few kilometres north of Mount Macedon.