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 Russia. The name "Elbrus" is a metathesis of "Alborz", which is also the name of a long mountain range in northern Iran. It is derived from Avestan "Harā Bərəzaitī", which is a legendary mountain in Iranian mythology. "Harā Bərəzaitī" reflects Proto-Iranian *"Harā Bṛzatī", which was reformed into Middle Persian as "Harborz", and into Modern Persian as "Alborz". "Bṛzatī" is the feminine form of the adjective *"bṛzant" ("high"), the reconstructed ancestor of Modern Ossetian "bærzond" ("high", "peak"), Modern Persian "barz" ("high"), "berāzande" ("elegant"), and "boland" ("high", "tall"), and Modern Kurdish "barz" ("high"). "Harā" may be interpreted as "watch" or "guard", from