Sumida River
Kōtō is located east of the Tokyo metropolitan center, bounded by the Sumida River to the west and the Arakawa River to the east. Its major districts include Kameido, Kiba, Kiyosumi, Monzen-nakachō, Shirakawa, and Toyosu. The waterfront area of Ariake is in Kōtō, as is part of Odaiba.