It was near Romulan space and Starbase 10. (TOS: "The Deadly Years") The starships Exeter and John F. Kennedy helped establish the colony on Gamma Hydra IV in 2254. (Orion Press: The Mindsweeper) In 2267, USS Concordat distinguished herself in action against Klingons in the Gamma Hydra sector. (TrekRPGNet) In the Kobayashi Maru scenario undertaken by command cadets at Starfleet Academy, the purported location of the ship is in "Gamma Hydra, Section 10." (Star Trek II: The Wrath of Khan)