Zarus was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, in orbit of the Zarus Thustra star system, at coordinates 2.38N 2.17E.

In the 23rd century, Zarus was home to a Human colony noted for agriculture and industry. By reference stardate 2/2306.01, the world had a population of 1.84 billion individuals, mostly Human, and the government was a full-status colonial member of the Federation. (FASA RPG module: The Federation)