Sidinial was a star system located in the Orion Neutrality Area in the Alpha or the Beta Quadrant.

Its system was home to a number of planets. Sidinial IV, or Zchol, was the only Class M world. It was home to an Orion Colony, and was also a homeworld to four previous races: the Athan, Shani, Kezt and the original native inhabitants (FASA RPG module: The Orions: Book of Common Knowledge).

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