The Sumida River is a river that flows through central Tokyo, Japan. It branches from the Arakawa River at Iwabuchi and flows into Tokyo Bay. Its tributaries include the Kanda and Shakujii rivers.
It passes through the Kita, Adachi, Arakawa, Sumida, Taitō, Kōtō and Chūō wards of Tokyo.
What is now known as the "Sumida River" was previously the path of the Ara-kawa. From Wikipedia
