The Twelve Apostles, along Victoria’s Great Ocean Road in the Port Campbell National Park, are spectacular giant rock stacks rising from the waters of the Southern Ocean. The highest of the outcrops is around 45 metres tall. The apostles had their beginnings up to 20 million years ago when the 70-metre high limestone cliffs along the shore were gradually eroded by pounding wind and water, creating the stacks and separating them from the shoreline.