Seven Third Summits Sumantri () and Ngga Pulu (). The definition of "continent" is a matter of some dispute among mountaineers seeking to complete this challenge. The main ridge of the Greater Caucasus range is generally considered to form the boundary between Europe and Asia. In that case, Mount Elbrus () and Dykh-Tau (), are the two highest mountains in Europe. Excluding the Caucasus Mountains, Mont Blanc () and Monte Rosa () would be Europe's two highest mountains. The Australian continent is defined as comprising the mainland of Australia and proximate islands on the same continental shelf, including Tasmania and New Guinea. In
Mount Gibbo Mount Gibbo Mount Gibbo is a mountain in the Australian Alps. It is 38 kilometres to the north-east of Benambra in Victoria, Australia and lies within the Mount Gibbo Natural Features and Scenic Reserve managed by Parks Victoria. The reserve, which covers 1493.1 hectares, was established in 1979. On the northern side of the mountain, Ordovician sediments are exposed on the steep slopes. Surrounding peaks include Mount Pinnibar (1772 metres) to the north, Mount Hope (1558 metres) to the south-east and Mount Sassafras (1587 metres) to the west. Plant species found in the reserve include the rare Alpine Phebalium ("Phebalium