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Sector 21290

From Memory Alpha, the free Star Trek reference

Real World article
(written from a Production point of view)

In the Operation Retrieve flipchart, Sector 21290 was a sector shared by the Federation and Klingon. A notable feature of this sector was the Neutral Zone. The starship USS Helin was assigned to a patrol of this zone in 2293. (Star Trek VI: The Undiscovered Country)

This sector was named on the fourth page of the flipchart, which was not seen in the film. Images of that page can be found here.
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