Atlantis served as the Capital to the Ancient presence in the Pegasus Galaxy.
- Atlantis is powered by three Zero Point Modules. It can also draw power from an underwater geothermal station, Tau'ri Naquadah generators, solar panels on the city, and lightning strikes.
- The city is submersible, capable of resisting water pressure to unspecified depths.
- The city is capable of lifting off from a planet's surface and making intergalactic flights.
- Atlantis has an Ancient drone weapon launching system, although its ammunition reserves were almost completely depleted during the war with the Wraith.
- The city as several dozen Puddle Jumpers in several bays.