Starbase 336 was a Federation starbase in Starfleet's use in the 24th century, located somewhere in the galaxy's Alpha or Beta Quadrant.
History and specifics[]
In the year 2365, this starbase received a signal from the 23rd century Klingon battle cruiser IKS T'Ong. It relayed the signal to Starfleet, and they sent the starship USS Enterprise-D to intercept the T'Ong. (TNG episode: "The Emissary")