Passgate was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, in orbit of the Alpha Geminorum star system, at coordinates 2.07S 2.16E.
In the 23rd century, Passgate was home to a Federation colony that was a center for trade and the location of a Starfleet base. By reference stardate 2/2306.01, the world had a population of around 1.75 billion individuals of various races, chartered as an associate member of the Federation. (FASA RPG module: The Federation)