The Expansion Region lay just outside the Colony worlds.
In JvS 1.0 Universe, it contained Contruum, Gyndine, Osarian, Rhommamool, and Tynna; Other planets were added in 1.5.
“For Osarian's canon history, see Wookiepedia article Osarian was one of the relatively few...Osarian
“Rhommamool was a world in the Expansion Region. Rhommamool was a red desert world, with a large...Rhommamool
“Ner vode, it can't be but this article is a stub. You can help Jedi vs Sith Wiki by expanding...Tynna