Alpha Onias III was the uninhabited third planet of the Alpha Onias system, in the Beta Quadrant. This system was located in the Onias sector, a region of space near the Romulan Neutral Zone. Although it was class M, Starfleet survey teams listed Alpha Onias III as barren and inhospitable with an atmosphere containing high, but non-toxic, levels of volcanic gases, including sulfur dioxide, methane, and hydrogen sulfide.

Barash, a humanoid child, was hidden in a cavern by his mother after their homeworld was invaded in the mid-24th century. The cavern was equipped with neural scanners that were able to transform matter into any form imagined, so that Barash could live in safety. He later left the planet for the USS Enterprise-D in 2367. (TNG: "Future Imperfect")

This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad".
"OH-nye-is" was the pronunciation for this planet's name from the script pronunciation guide. The same script described it as "a dull, gray planet".
The planet model for Alpha Onias III was first used for Ramatis III. ("Loud As A Whisper") It was used again for Gamma Hromi II. ("The Vengeance Factor")

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