Sector 25434
Sector 25434 was a spatial region in the Beta Quadrant. The Romulan Star Empire claimed this sector for itself.
In the 2360s, this sector was charted by the Vega Nine probe, which discovered a living spacecraft, code named "Tin Man", in the Beta Stromgren system. In 2366, the primary of this system, Beta Stromgren, supernovaed. (TNG: "Tin Man")
This sector was only mentioned in writing.
The quadrant of origin for this sector was inferred from the location of Starbase 152, which was the closest starbase for the damaged USS Enterprise.