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 Elbrus Indo-European *"ser" ("protect"). Elbrus stands north of the main range of the Greater Caucasus and south-southwest of the Russian town of Kislovodsk. Its permanent icecap feeds 22 glaciers, which in turn give rise to the Baksan, Kuban, and Malka Rivers. Elbrus sits on a moving tectonic area, and has been linked to a fault. A supply of magma lies deep beneath the dormant volcano. Mount Elbrus was formed more than 2.5 million years ago. The volcano is currently considered dormant. Elbrus was active in the Holocene, and according to the Global Volcanism Program, the last eruption took place about AD