Nivalla Septra and Iridin starchart

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

Iridin was a Federation border colony.

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")

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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