Olmerak is a binary star system located in the Cardassian Union. (ST reference: Star Charts) In 2318, the Bajoran starship Eleda disappeared near the Olmerak system. (TLE - Terok Nor novel: Day of the Vipers) During the Dominion War, the Dominion maintained a base in the Olmerak system, where several Jem'Hadar fighters were stationed. In 2375, Legate Damar and Weyoun ordered the Jem'Hadar squadron based there to intercept the USS Rio Grande. (DS9 episode: "Treachery, Faith, and the Great River")