Starbase 12

Starbase 12 is a Federation starbase and is located in orbit of the Rhodes colony in the Gamma 400 system of the Fries-Posnikov Sector. Starbase 12 is one of the most important outposts in the Federation as it is in reach of both the Klingon and Romulan empires. (TOS episode: "Space Seed" and TNG novel: Ship of the Line).