Unroth III was a Romulan colony world in the Unroth system in the Onias Sector near the border with the Cardassian Union. (ST reference: Star Charts, ENT novel: The Good That Men Do)

Sometime prior to the planet's colonization, the Romulan Star Empire set up a cloaked minefield very close to the planet. In 2152, the Earth Starfleet vessel Enterprise (NX-01) unknowingly entered the field, suffering heavy damage before being warned to leave. (ENT episode: "Minefield")

The planet being in vacinity of the minefield was not mentioned in the episode, but was stated in the reference work "Federation: The First 150 Years."

During the Dominion War, Dominion forces planned an attack on the colony upon discovering that the planet's long-range scanners were under repair. (DS9 episode: "Strange Bedfellows")

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