Starbase 257 was a Federation space station that was in service with Starfleet in the late 24th century. 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 USS Shenandoah had left the station en route to Ferenginar. (DS9: "Valiant")

For more information on the model used for this design, please see studio models.
According to Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Starbase 257 was located in the Alpha Quadrant.

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