Breen system
The Breen system was an inhabited planetary system in the Alpha Quadrant. A planet in this system, , was the homeworld of the Breen, a warp-capable humanoid species. This was the capital system of the Breen Confederacy and, in 2375, was allied with the Dominion. ()

In 2399, the location of Breen was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in neutral space. () 

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Star systems