Khitomer City is a city on Khitomer.
During the invasion of the Borg Collective in 2381, Khitomer was one of five simultaneous attacks from Borg cubes, along with Korvat and Federation starbases 157, 234, and 343. The Klingon High Council felt the invasion was a purely internal Federation matter, until the USS Arimathea, USS Constant, and USS Ranger sacrificed themselves to save the planet. Governor Talgar, who had watched the skies from Khitomer City, delivered Starfleet's sensor readings to Chancellor Martok, who was able to convince the rest of the High Council to devote Klingon Defense Force assets to the fight. (ST - Destiny novel: Gods of Night)