Southern continent of Tagra IV
From Memory Alpha, the free Star Trek reference.
The southern continent was a land mass located on the planet Tagra IV.
In 2368, Tagran engineer Orn Lote noted to the crew of the USS Enterprise-D that his engineers were having difficulties with the power reactor for the barystatic filters on the planet's southern continent. He advised that they may need to shut the reactor down for repairs. (TNG: "True Q")
