Quad L-14
Quad L-14 was a spatial region in the Beta Quadrant. Territory of the Klingon Empire was within this region.
In the mid-2270s, a sensor drone from the Epsilon IX station intercepted a transmission from the Klingon captain of the K't'inga-class IKS Amar. The Amar was the flagship in a patrol formation of three battle cruisers that intercepted V'ger. The interception resulted in a battle, which ended with the destruction of the three ships. (Star Trek: The Motion Picture)
The quadrant of origin for this region was inferred from the location of Epsilon IX station, which was attacked by V'ger soon after it had destroyed the Klingon battle cruisers.