A cloud over the southwest horizon they had seen the day before proved through the telescope to be land, probably the mountains observed by Shackleton in 1909.
"Right on our course -- South --" wrote Amundsen, "we can see not a trace of land, and that promises well." 
Reaching 83° S., they stopped to build their next depot.
 Roald Amundsen Bildearkiv, Nasjonalbiblioteket. Note that this is dated "9-11-11" by the NB.
 Roald Amundsen, [9 November 1911], quoted by Roland Huntford in Scott and Amundsen (New York : Putnam, 1980, c1979), p.437.