Alondra was the uninhabited third planet of the Pallas 14 system. (TAS: "One of Our Planets Is Missing") It was located in the Alpha Quadrant. (Star Trek VI: The Undiscovered Country production art)
In 2269, the USS Enterprise attempted to intercept an unidentified cosmic cloud that had entered the system near Alondra. However, en route, the crew noticed Alondra disappear from sensors, only to observe that planet was engulfed and consumed by the cosmic cloud creature. (TAS: "One of Our Planets Is Missing")
In the star chart "The Explored Galaxy", the star Pallas 14 was positioned between the Tholian Assembly and Romulus. Both were identified in DS9: "Call to Arms" as being located in the Alpha Quadrant.
The location of the Pallas 14 system in "The Explored Galaxy" star chart
Orbit of Alondra