The combined area of the part of Nishikyo Ward to the west of the Katsura-gawa River and Otokuni-gun (including Muko City and Nagaokakyo City) is referred to as Nishigaoka or Nishiyama.
桂川以西の西京区と、乙訓郡（向日市・長岡京市を含む）をあわせて、西ヶ岡あるいは西山とよばれる。