Tokyo Bay
Tokyo Bay juts prominently into the Kantō Plain, surrounded by the Bōsō Peninsula in Chiba Prefecture to the east and the Miura Peninsula in Kanagawa Prefecture to the west. The shore of Tokyo Bay consists of a diluvial plateau that is subject to rapid marine erosion. Sediments on the shore make for a smooth, continuous shoreline stretching across the region. In a narrow sense, the bay covers about 150 square kilometers north of the straight line from Cape Kannon to Cape Futtsu. This area has shrunk slowly over time as reclamation projects continue. A broader definition includes the Uraga Channel, expanding the total area to roughly 927 square kilometers combined with the channel. The shoal between Cape Futtsu and Cape Honmaku is known as Nakanose, and it has a depth of only 3 meters. North of this shallow point, the bay maintains a depth of 20 meters with uncomplicated underwater topography. Areas south of Nakanose become significantly deeper as they move toward the Pacific Ocean.
In ancient times, the Japanese knew this body of water simply as Edo Bay. By the Azuchi, Momoyama period spanning 1568 to 1600, the area had become known by a different name after the city of Edo rose in prominence. The bay took its present name in modern times following the Imperial court's move to Edo. That relocation occurred in 1868 when officials renamed the city Tokyo. Historical records show that the name change reflected the shifting political center of Japan during the Meiji Restoration. Artists like Hokusai depicted the scene from Tsukuda Island looking out toward Mt. Fuji far away. These images captured a time when ships crowded the waters before industrialization transformed the coastline. The evolution of names mirrors the transformation of the region from a feudal port to an imperial capital.
Land reclamation has been carried out along the coast of Tokyo Bay since the Meiji period began in 1868. Areas along the shore with a depth of less than 20 meters are simplest to carry out landfill operations. Sand from the floor of Tokyo Bay is used for these projects to expand usable land. The topography of the shoreline differs greatly from that of the pre-modern period due to ongoing work. Tokyo Bay includes about 173 square kilometers of reclaimed land as measured in 2012. Aggregate household waste production is enormous in Greater Tokyo, leaving little room for traditional garbage disposal sites. Waste is rigorously sorted at the household level, and much of it is turned into ash. This recycled material is further processed into bay landfill to create new ground. Yumenoshima briefly opened as a public beach before being repurposed and used as a landfill between 1957 and 1967. Hakkei Island was constructed in 1985 and now hosts Yokohama Hakkeijima Sea Paradise.
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. It was subsequently incorporated into the Tokyo Bay Fortress during the Meiji period. The Imperial Japanese Navy maintained a degaussing station on the island until the end of World War II. Today the island is uninhabited and serves as a marine park. Many artificial islands were built as naval fortifications in the Meiji and Taishō periods. Odaiba was one of six artificial islands constructed in 1853 as a fortification to protect the Tokugawa shogunate at Edo. Commodore Matthew Perry sailed his four Black Ships into Edo Bay on the 8th of July 1853. He began negotiations with the Tokugawa shogunate that led to a peace and trade treaty between the United States and Japan
in 1854. The Japanese Instrument of Surrender was signed on the 2nd of September 1945, aboard the USS Missouri anchored in the bay. A flag from one of Commodore Perry's ships was flown from the Naval Academy Museum and displayed at the ceremony.
A number of Japan's most important ports are located in Tokyo Bay today. The Port of Yokohama, the Port of Chiba, the Port of Tokyo, the Port of Kawasaki, the Port of Yokosuka, and the Port of Kisarazu rank among the busiest in Asia-Pacific Region. The Tokyo Bay Aqua-Line bridge, tunnel crosses Tokyo Bay between Kawasaki and Kisarazu. The Tokyo-Wan Ferry also crosses the bay toward the Uraga Channel between Kurihama and Kanaya. Numerous rivers empty into Tokyo Bay, providing water for residential and industrial areas along the coast. The Tama and Sumida rivers empty into the bay at Tokyo. The Edo River empties into Tokyo Bay between Tokyo and Chiba Prefecture. The Obitsu and Yōrō rivers empty into the bay in Chiba Prefecture. The Port of Yokosuka contains naval bases of both the Japan Maritime Self-Defense Force and United States Forces
Japan. These infrastructure networks connect the region to global trade routes while supporting local communities.
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Common questions
What is the total area of Tokyo Bay in square kilometers?
In a narrow sense, Tokyo Bay covers about 150 square kilometers north of the straight line from Cape Kannon to Cape Futtsu. A broader definition that includes the Uraga Channel expands the total area to roughly 927 square kilometers combined with the channel.
When did officials rename Edo Bay to Tokyo Bay?
The bay took its present name following the Imperial court's move to Edo in 1868 when officials renamed the city Tokyo. Historical records show that the name change reflected the shifting political center of Japan during the Meiji Restoration.
How much reclaimed land exists within Tokyo Bay as measured in 2012?
Tokyo Bay includes about 173 square kilometers of reclaimed land as measured in 2012. Land reclamation has been carried out along the coast since the Meiji period began in 1868 using sand from the floor and recycled household waste ash.
On what date was the Japanese Instrument of Surrender signed aboard the USS Missouri in Tokyo Bay?
The Japanese Instrument of Surrender was signed on the 2nd of September 1945 aboard the USS Missouri anchored in the bay. Commodore Matthew Perry sailed his four Black Ships into Edo Bay on the 8th of July 1853 before this event occurred.
Which rivers empty into Tokyo Bay at Tokyo and Chiba Prefecture?
The Tama and Sumida rivers empty into the bay at Tokyo while the Edo River empties between Tokyo and Chiba Prefecture. The Obitsu and Yōrō rivers also empty into the bay in Chiba Prefecture to provide water for residential and industrial areas.