(covers information from Vanguard universe)
The Bajoran wormhole was an artificial construct built by the beings known to the Bajoran people as the Prophets, with a terminus in the Alpha Quadrant in the Denorios Belt of the Bajor system and another less than five light-years from the Idran system in the Gamma Quadrant, approximately 70,000 light-years distant. The wormhole was of major religious significance to the Bajorans, who called it the Celestial Temple. The wormhole was discovered in 2369 by then Commander Benjamin Sisko and Lieutenant Jadzia Dax.
Vanguard Command[]
The Alpha Quadrant terminus of the wormhole is guarded by Deep Space 9 and Task Force Belligerent.
The Gamma Quadrant terminus of the wormhole is 8 light years away from Station DSG1 and is guarded from that end by Task Force Dauntless and the Klingon Task Force Mek'leth of the House of Toral.
Shortly after its reopening, starships of Task Force Dauntless and a fleet of cargo carriers and transport ships crossed the wormhole, bringing constuction materials, components and personnel for the establishment of Station DSG1 and Abraxis Base in the Gamma Quadrant.