Terra 4 was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, in orbit of the Barnard 183 star system, at coordinates 2.18N 0.24E.

Terra 5 was so named as it was the fourth extra-solar colony effort launched from Earth.

By the 23rd century, Terra 4 was home to a thriving Human colony, a noted center of culture and industry. By reference stardate 2/2306.01, the world had a population of 5.58 billion individuals, mostly Human, and the government was a full-status colonial member of the Federation. (FASA RPG module: The Federation)