Adachi (足立区, Adachi-ku) is a special ward located in Tokyo Metropolis, Japan. It is located to the north of the heart of Tokyo. The ward consists of two separate areas: a small strip of land between the Sumida River and Arakawa River and a larger area north of the Arakawa River. The ward is bordered by the cities of Kawaguchi, Sōka and Yashio in Saitama and Katsushika, Sumida, Arakawa and Kita in Tokyo. The ward is called Adachi City in English. As of May 1, 2015, the ward has an estimated population of 692,707 and a population density of 13,010 persons per km². The total area is 53.25 km².