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This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.

Admiral Katrina Cornwell brings up a holographic diagram of the attacks on Iridin (bottom right), Nivalla, and Septra

Iridin was a Federation border colony in the Alpha Quadrant.

During the Federation-Klingon War of 2256, on or around stardate 4851.5, the Klingons launched an attack at the research outpost located in this colony. The children who were spared found themselves as orphans. (DIS: "The War Without, The War Within")

In 2399, the location of Iridin was labeled in a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. (PIC: "Maps and Legends")

In 3189, the location of Iridin was denoted on a holographic star chart of the galaxy at Federation Headquarters. (DIS: "Scavengers")

According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("United Federation of Planets"), Iridin was located near Organia.
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