The Seven Second Summits list follows the Seven Summits list created by Richard Bass, who chose the highest mountain of mainland Australia, Mount Kosciuszko (2,228 m), to represent the Australian continent's highest summit. Reinhold Messner proposed another list (the Messner or Carstensz list), replacing Mount Kosciuszko with Western New Guinea's Carstensz Pyramid, which is part of Indonesia (4,884 m). Following the Bass list, Mount Townsend is the second-highest summit (2,209 m) in Australia. According to the Messner list, Puncak Mandala (4,760 m) on New Guinea is the second highest of the Australian continent. Heights of mountain peaks in West Papua are poorly established, and Puncak Trikora has been listed as the second-highest summit on the island, but SRTM data do support a higher elevation for Mandala.