Gorn space (lower-right) relative to the Federation and the Klingon Empire, 2259
Gorn space was the territorial region of space claimed by the Gorn Hegemony.
In 2259, the Federation constructed a refinery in a nebula close to this space. (SNW: "Lost in Translation")
In 2267, the Gorn, believing that the Federation colony on Cestus III was an intrusion into their space, attacked and destroyed it. (TOS: "Arena")