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Yadera Prime was the inhabited prime planet in its star system. This system was located in the Gamma Quadrant.

The planet was the homeworld of the Yaderans, a warp-capable humanoid species. Around 2340, the planet was conquered by the Dominion, which, according to Rurigan, caused the Yaderan way of life to change dramatically. (DS9: "Shadowplay")

This planet was only mentioned in dialogue.
According to the script, the pronunciation for Yadera was "yah-DER-ah". [1]
According to Star Trek: Star Charts (pp. 71, 74), Yadera Prime was a M-class planet. This planet was annexed by the Dominion in 2340. The dominant species were the humanoid Yaderan. The Yaderan were warp-capable in circa 2200. Their world orbited a G-class star.

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