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 Kazbek Mount Kazbek Mount Kazbek (; ; ; ), is a dormant stratovolcano and one of the major mountains of the Caucasus located on the border of Georgia's Kazbegi District and Russia's Republic of North Ossetia–Alania. It is the third-highest peak in Georgia (after Mount Shkhara and Janga) and the seventh-highest summit in the Caucasus Mountains. Kazbek is also the second-highest volcanic summit in the Caucasus, after Mount Elbrus. The summit lies directly to the west of the town of Stepantsminda and is the most prominent geographic feature of the area. Mount Kazbek is the highest peak of Eastern Georgia. The