Originally, Sakyo indicated the east side area of Heian-kyo Capital (Rakuyo or Rakuchu), but the Sakyo Ward, which was born as an administrative area of Kyoto City, is located in the Rakuto (Rakugai) area on the left side of the Kamo-gawa River (Yodo-gawa River system).
本来左京と言えば平安京のうちの東側（洛陽または洛中）のことであったが、京都市の行政区として生まれた左京区は鴨川_(淀川水系)左岸の洛東（洛外）地域にあたる。