Southern Tundra

The Southern Tundra is the southern-most continent of the planet Mobius, constantly featuring to frozen temperatures and snow storms. For a while it acted as the home to the self-exiled Overlander Nate Morgan and his friend Eddy the Yetti, though after his house was destroyed in a battle between Sonic, Tails and Ixis Naugus resulting in Eddi's death, Nate returned with the two heroes to Knothole. (StH: #64, #65, #66)

Some time later, Sonic returned to the southern tundra to place a rose on Eddy's grave, only to be attacked by the recently escaped Naugus once again. Sonic defeated Naugus however, once again imprisoning him in the Zone of Silence before returning to Knothole. (SSS: #15)