The Port Phillip Heads Marine National Park is a marine protected area located in the vicinity of the bay of Port Phillip, between the Bellarine and Mornington Peninsulas, in Victoria, Australia. The 3,580-hectare (8,800-acre) marine national park comprises six separate sites located approximately 60 kilometres (37 mi) south-west of Melbourne and stretches along 40 kilometres (25 mi) of coastline of Victoria.