In 2364, the location of Starbase 0834 was labeled on the map Starbase Ops Status Sol Sector. (TNG: "Conspiracy" , okudagram) This starbase was only mentioned in writing. According to the Star Trek Encyclopedia (3rd ed., p. 466) , after "The Neutral Zone" had aired, where Starbase 718 was mentioned in dialogue, it was decided that the starbase numbers shouldn't go much higher than 500.