), also known as the Sagami Gulf
or Sagami Sea
, lies south of Kanagawa Prefecture
, central Japan
, with the Miura Peninsula
to its east and the Izu Peninsula
to its west. It lies approximately 40 kilometres (25 miles) southwest of the capital, Tokyo
. Major cities on the bay include Chigasaki
, including the fictional city of Hinata
The epicenter of the Great Kantō earthquake
in 1923 was deep beneath Izu Ōshima
Island in Sagami Bay. It devastated Tokyo
, the port city of Yokohama
, surrounding prefectures of Chiba
, and Shizuoka
, and caused widespread damage throughout the Kantō region.
A branch of the warm Kuroshio
(Black Current) warms the bay, allowing it to host marine organisms typical of more southerly regions and giving a mild climate to the land bordering the bay. The maximum depth of the bay is about 1500 meters.
Organisms from sub-arctic regions are also advected into the bay by intrusions of the Oyashio Current resulting in a very high [biodiversity]. It is the major study site for research programs at the University of Tokyo (ORI) and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC).
In 2004, soil samples from the bay were found to contain radioactive contamination from the Bikini Atoll nuclear tests that took place from 1946 to 1958.