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Memory Alpha

Outpost 23 was an Earth Outpost that entered into service after stardate 1292.4 in the 24th century. This outpost was located on the Federation side of the Federation-Romulan border in the Beta Quadrant. This outpost was located at the terminus of the zone (PIC: "Disengage")

In 2367, it was the key outpost in Starfleet's defenses along the border and its location was a tightly guarded secret.

That year, in a holoprogram created for William T. Riker by Barash on Alpha Onias III, Outpost 23 was supposedly no longer of strategic importance and was slated to be the site of final peace negotiations between the Federation and the Romulan Star Empire, an apparent ruse to reveal the location of the outpost. (TNG: "Future Imperfect")

In 2401, the location of this outpost was labeled in a chart used on aboard the SS Eleos XII. (PIC: "Disengage")

This outpost was only mentioned in writing.
The chart from the SS Eleos XII originated in the Star Trek: Star Charts and was modified for its appearance in the episode. Dave Blass published pictures of the set on his website.
This outpost does not appear on the star chart from the film Star Trek: Section 31 which was set on stardate 1292.4, in the early 24th century. Assuming outposts entered into service consecutively, this outpost entered service before 2367, when Outpost 23 was stated to be in service.

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