Starbase 234 was a Federation starbase administered by Starfleet. This planetary base was located close to both Klingon and Romulan territory, in the Beta Quadrant.
In 2256, this starbase's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad")
In 2257, during the first Federation-Klingon War, this starbase was occupied by the Klingons. (DIS: "The War Without, The War Within")
Later that year, its location was labeled on the star chart showing the trajectory of Lieutenant Spock's shuttle. (DIS: "An Obol for Charon")
Following the outbreak of civil war in the Klingon Empire in late 2367, Captain Jean-Luc Picard retreated to this facility from Qo'noS. At this time, the station was commanded by Fleet Admiral Shanthi. Picard successfully persuaded the admiral to launch a blockade force from the starbase to the Klingon-Romulan border, to prevent Romulan forces covertly supplying the House of Duras. Picard's task force was formed by commandeering all ships in the base's shipyards, along with all ships within one day's travel of the starbase. (TNG: "Redemption II")
In early 2368, the USS Enterprise-D was recalled to the starbase from a terraforming mission to Doraf I by Fleet Admiral Brackett on a sensitive matter – the disappearance of Ambassador Spock, and his subsequent discovery on Romulus. (TNG: "Unification I")
In 2399, the starbase's location was labeled on a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. (PIC: "Maps and Legends")