Bajor sector

The Bajor sector, or Bajoran sector, was a region of space in the Alpha Quadrant. This sector contained the Bajoran system, the Federation space station Deep Space 9 and Starfleet's Antares Ship Yards.

The Klingon Empire attempted to place a minefield around the sector in 2372, but their plan was stopped after Worf and Kurn obtained the detonation codes. 

In 2375, while he was posing as Wendell Greer, Luther Sloan told Julian Bashir he had many questions about the sector, such as its navigational anomalies and transport patterns. 

''In the mirror universe, Terok Nor was the center of authority for the sector. ''

''In an alternate timeline Starfleet had to leave Deep Space 9 and the Bajoran sector. The Klingon Empire took over the control of the sector.''

Apocrypha
The non-canon RPG book Star Trek: Deep Space Nine - Narrator's Toolkit, published in, include a chart of the area and indicates that the Bajoran sector is a cubic area (width = 85 ly ; length = 102 ly ; depth = 90 ly) that contains over a dozen of major star systems and many stellar points of interest:
 * the Badlands
 * the Bajoran system (Bajor, Bajoran wormhole, Deep Space 9, Denorios belt)
 * the Cardassian system
 * the Ferengi system / Ventarus Idrilon system (six planets including Ferenginar)
 * the Chin'toka system
 * the Dreon system (eleven planets including a Bajoran colony on Dreon VII)
 * the Gemulon system (including a Federation colony on Gemulon V)
 * the Monac system (Monac shipyards)
 * the Nehru system (four planets including the Federation Nehru colony)
 * the Orellius Major system
 * the Orellius Minor system
 * the Pedrigal system
 * the Sanelar system (Bajoran colony of Free Haven)
 * the Valo system (Bajoran colonies of Valo I, II and III)
 * the Volnar system (Volnar colony affiliated to the Cardassian Union)
 * Starbase 375
 * Altenek Nor shipyards

Bajoranischer Sektor Secteur bajoran ベイジョー・セクター Bajor sector