St. Cyr was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, in orbit of the Wolf 672 star system, at coordinates 1.25N 3.03E.

In the 23rd century, St. Cyr was home to a Human agricultural colony. By reference stardate 2/2306.01, the world had a population of less than 100,000 individuals, mostly Human, chartered as a dependent Federation colony. (FASA RPG module: The Federation)