The Alpha Onias system was an uninhabited but strategically significant planetary system in the Beta Quadrant. This system, located within the Onias sector, was located near the Romulan Neutral Zone in the mid-24th century.

Alpha Beta Quadrant Overview star chart

Alpha/Beta Quadrant Overview

In 2256, this star's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad")

In 2257, during the first Federation-Klingon War, this star's system was occupied by the Klingon forces. (DIS: "The War Without, The War Within")

In 2367, subspace anomalies were detected in this system, originating from Alpha Onias III. As there had been rumors about a secret Romulan base in the region for quite some time, the USS Enterprise-D proceeded to investigate it further. (TNG: "Future Imperfect"; DIS: "Magic to Make the Sanest Man Go Mad")

"OH-nye-is" was the pronunciation for this system's name from the script pronunciation guide.
According to the Star Trek: Star Charts (pp. 61, 62, 66) and Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", p. 38; "Federation Historical Highlights, 2161-2385"), Alpha Onias's primary was a M-class star.
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