Starbase 234

Starbase 234 is a Federation starbase located near Romulan space. Following the outbreak of Klingon Civil War|civil war in the Klingon Empire in late 2368, 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)

Later that year, 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)