In 2285, during his mission of vengeance against James T. Kirk, Khan Noonien Singh swore that he would chase Kirk "'round the moons of Nibia and 'round the Antares maelstrom and 'round perdition's flames" before giving up. (Star Trek II: The Wrath of Khan)
This planet was only mentioned in dialogue.
According to the 2015 Star Trek: Ships of the Line calendar, one of the moons of Nibia was a small, cratered world fortified by multiple large bases. Multiple Federation Saber-class starships once waged an assault upon the moons of Nibia in the 24th century.