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

Septra was a Federation border colony in the Beta 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 colony's location was labeled on a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. (PIC: "Maps and Legends")

According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("History of the United Federation of Planets"), Septra was located in the Beta Quadrant.
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