More info: Tokyo Bay is located in the southern Kantō region of Japan, and spans the coasts of Tokyo, Kanagawa Prefecture, and Chiba Prefecture.
Tokyo Bay is connected to the Pacific Ocean by the Uraga Channel. The Tokyo Bay region is both the most populous and largest industrialized area in Japan. Much land has been reclaimed along the bay’s shoreline, and most of this is now used for industrial sites and port facilities that are part of the Keihin Industrial Zone.
The only natural island in Tokyo Bay is Sarushima at Yokosuka in Kanagawa Prefecture. Sarushima was one of the locations fortified with coastal artillery during the Bakumatsu period and was subsequently incorporated into the Tokyo Bay Fortress during the Meiji period. The Imperial Japanese Navy maintained a presence on the island until the end of World War II. The island is now uninhabited and is a marine park.
Many artificial islands were built as naval fortifications in Tokyo Bay. After World War II these islands were converted to residential or recreational use.