For the mirror universe counterpart, see Elba II (mirror).

Elba II was a planet located in the space of the galaxy's Alpha or Beta Quadrants, the second planet in orbit of the Elba star system. With a toxic atmosphere, Elba II was the home to the Federation's Elba II asylum for the criminally insane. (TOS episode & Star Trek 5 novelization: Whom Gods Destroy)

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