Starbase 257 was a Federation starbase located in the Alpha Quadrant. While within its defense perimeter, ships had to remain at one-half impulse.
In 2374, the Starbase was attacked by a wing of Jem'Hadar fighters, shortly after the runabout Shenandoah had left the station enroute to Ferenginar. (DS9: "Valiant")
- The Starbase 257 was a reuse of Starbase 375.
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