Sector 23 was a region of space in the Beta Quadrant. A section of the Romulan Neutral Zone was located in this sector.

In 2365, the Federation established Starbase 173 in this sector. This Starfleet administered facility was located near the neutral zone. (TNG: "The Measure Of A Man")

This sector's quadrant of origin is inferred based on the position of the starbase as seen in the star chart appearing in the Star Trek: Picard episode "Maps and Legends".
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