A Federation starbase where Picard argued in 2368 for a blockade of the Klingon–Romulan border, and where the Enterprise-D was later recalled to learn of Spock's disappearance.
Starbase 234 is a Starfleet command base within reach of both Klingon and Romulan space. It figures in the fifth-season Next Generation episodes Redemption II and Unification I.
During the Klingon Civil War, Picard travels to Starbase 234 to put a proposal to Fleet Admiral Shanthi. Convinced that the Romulans are secretly supplying the Duras family, he asks for a fleet to form a tachyon detection net along the border. Shanthi agrees, and Picard assembles some twenty ships from those available in the region.
Later in 2368 the Enterprise-D is recalled to the starbase, where Fleet Admiral Brackett tells Picard that Ambassador Spock has been sighted on Romulus, a briefing that sets the events of Unification in motion.