Vornok was a star system, located somewhere in the galaxy's Alpha or Beta Quadrants, in or near the 23rd century borders of Federation space.
History and specifics[]
Mister Akara, a private practice patient of Doctor Leonard McCoy in the year 2293, was planning a trip to the Vornok system for vacation. Akara asked McCoy for the proper series of immunizations, as apparently there was an implied reputation of one or more communicable diseases common to vacationers in this area. (TOS novel: The Fearful Summons)