Southern continent of Malcor III
From Memory Alpha, the free Star Trek reference
The southern continent was a region on planet Malcor III. It is the location of the Marta community.
In 2367, while working undercover preparing to make first contact, William T. Riker, while disguised as a Malcorian named Rivas Jakara claimed to be from the Marta community on the southern continent. (TNG: "First Contact")
