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
Volcanic Seven Summits Volcanic Seven Summits The Volcanic Seven Summits are the highest volcanoes on each of the seven continents, just as the Seven Summits are the highest peaks on each of the seven continents. Summiting all seven is regarded as a mountaineering challenge, first postulated as such in 1999. Two of the Volcanic Seven Summits are also in the Seven Summits list. Mount Kilimanjaro and Mount Elbrus, which were formed volcanically, are the highest peaks of their respective continents. Due to different interpretations of continental borders (geological, geographical, geopolitical) several definitions for the highest summits per continent and the number of continents