Christofi IX was a Federation resort colony in the 2280s.
In the 23rd century, Christofi IX was world under siege. In that time, several marauding warrior species, such as the Klingons extorted the natives of that world. However, in the 2280s, the United Federation of Planets worked closely with the natives to turn their world from a hotbed of horror to a perfect resort colony. Starfleet also established Starbase 30. In 2286, Captain James T. Kirk and his crew of the USS Enterprise-A took shore leave here. (TOS comic: "Getaway")