Betreka Nebulaedit
From Memory Alpha, the free Star Trek reference
The Betreka Nebula is an interstellar gas cloud located between the Klingon Empire and the Cardassian Union. The nebula was the site of the Betreka Nebula Incident between the two powers in the 24th century. (DS9: "The Way of the Warrior")
The non-canon Star Trek: Star Charts place the Betreka Nebula roughly halfway between the Klingon Empire and the Cardassian Union, near Aldebaran, Starbase 2 and Planet Q.
