Alpha Carinae V was the fifth planet in the Alpha Carinae system. This was the homeworld of the non-corporeal Drella. (TOS: "Wolf in the Fold") The location of the Alpha Carinae system in the Milky Way Galaxy was depicted in the "The Explored Galaxy" star chart. (TNG: "Conspiracy", production art)
On the "The Explored Galaxy" chart, the star Alpha Carinae was positioned between the Tholian Assembly and Romulus. According to dialog in "Call to Arms", the two were Alpha Quadrant powers.
The location of Alpha Carinae on "The Explored Galaxy" star chart
The location of Alpha Carinae on the tactical situation monitor