El-Auria is a planet whose civilization was assimilated by the Borg. Guinan once suggested that the age of the El-Aurian civilization was at least on the order of tens of thousands of years old, though she declined to be more specific. (TNG novel: The Buried Age) In an alternate timeline where Montgomery Scott rescued James T. Kirk before he could be absorbed into the Nexus, the Borg had not assimilated El-Auria; instead much of the Alpha Quadrant had fallen to a Borg push centered around Earth. (Star Trek novel: Engines of Destiny)