Cestus III was the third planet of the Cestus system, near the border between the United Federation of Planets and the Gorn Hegemony. It was known to the Gorn as Inner Eliar. The system was 400 light-years from Sol and about 35 light-years, in a spinward direction, from the Delta Triangle. (TOS: "Arena", Star Trek: Typhon Pact novel: Seize the Fire, Star Trek Star Charts)