There are currently no ultra marathons that meet our criteria that are currently being offered in Antarctica.
Previous ultra marathons that were run according to our criteria include.
The Ice Marathon 100k
This was run every year from 2005 to 2017. It has been discontinued as of 2017.
South Pole Ultra Marathon (48km)
There was one ultra marathon run at the south pole in 2002. This has been the only ultra marathon documented at the South Pole.