Sector 2158
Sector 2158, also known as the Yadalla sector, was a region of Federation space in the Beta Quadrant. It bordered the Beta, Antares, Terran, and Omicron sectors. 

Many planets in this sector contain archaeological sites of the Debrune or the ancient Romulans, including Barradas III, Calder II, Dessica II, Draken IV, Yadalla Prime, Yridia I, and Zoraster II, as well as several planets in the Taugan system. All those sites except for Draken IV and Yadalla Prime were raided by a mercenary ship commanded by Arctus Baran in 2370. ()

In the 2380s, a section of the holographic map of the Alpha and Beta Quadrants, displayed to the former prisoners of Tars Lamora aboard the , was labeled as the Yadalla sector. ()

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