Antarctica is the southernmost continent on Earth, essentially a collection of glaciers up to three kilometers thick sitting atop a few island. It holds Earth's temperature minimum at -82 degrees Celsius. It was the home to Atlantis before some of the Ancients migrated to the Pegasus Galaxy. Its outpost still remained, and was home to the planet's original Stargate. Major John Sheppard has said that he liked Antarctica, though Brigadier General Jack O'Neill has a different opinion.
Antarctica was the place the Ancients stationed Atlantis. When they departed, they left behind the original, and far more ancient, Stargate. When Colonel Jack O'Neill and Captain Samantha Carter emerged through the beta gate, they believed they had been transported to an ice planet. (SG1: "Solitudes")
After discovering the Stargate in Antarctica, a research team was set up to determine the impact of this information against current knowledge of the Ancients and the gate network. This team only found the remains of two Jaffa, and for roughly five years were relatively unsuccessful in discovering anything that related to the theories which had been formulated.
Almost ready to pack up and return to the United States, the research team discovered the preserved body of what was later to be recognized as a frozen being of the first Ancient race, or so it was believed. (SG1: "Frozen")
Antarctica was the location of the final battle of Earth's forces against Anubis. This confrontation left the most powerful Goa'uld force in the galaxy defeated. With Anubis disposed for the time being, talks were formed with eleven countries around Earth about the Antarctic Treaty and its relation to the scientific research that was to be conducted by the United States of America, lead by Dr. Elizabeth Weir, and members of Stargate Command, including Dr. Daniel Jackson. (SG1: "Lost City, Part 1")
- In an alternate reality, after Ra took the Stargate from Egypt, the second gate was still in the same location it was in our own reality. (SG1: "Moebius, Part 1")
- Discovery of the Second Stargate
- Discovery of an Ancient, Ayiana
- Discovery of the Ancient Outpost, Terra Atlantus
- Battle of Antarctica