Sybaron
Sybaron was a location in the Milky Way Galaxy, where the Seventh Fleet took heavy losses there in 2374, during the Dominion War. ()

Appendices

Background information 

According to Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Sybaron was the name of a star system in the Alpha Quadrant. The system's primary was a M-class star.

Apocrypha 
The encounter at Sybaron was mentioned in the  Hollow Men. In the novel, it was identified as a star system.

External link 
 

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Locations