ChÅ«Å is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as ChÅ«Å City. It was formed in 1947 as a merger oâŠChÅ«Å is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as ChÅ«Å City. It was formed in 1947 as a merger of KyÅbashi and Nihonbashi wards following Tokyo City's transformation into Tokyo Metropolis.