Short answers, pulled from the story.
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.
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.
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.
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.
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.