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The Barrica Valley was a location, a valley on planet Setlik III.
In the year 2362, the Barrica Valley was occupied by Cardassian Union forces when they invaded Setlik III following the massacre that was carried out by Laen Enkoa. (ST - Seven Deadly Sins novella: The Slow Knife)
Miles O'Brien later led a Starfleet team that attacked the Cardassians in the Barrica encampment. (DS9 episode: "Empok Nor")