is a large
artificial island in
Tokyo Bay,
Japan, across the
Rainbow Bridge from central
Tokyo. It was initially built for defensive purposes in the 1850s, dramatically expanded during the late 20th century as a seaport district, and has developed since the 1990s as a major commercial, residential and leisure area. Odaiba, along with
Minato Mirai 21 in Yokohama, are two of the only places in the Greater Tokyo Metropolitan area where the seashore is accessible, and not blocked by industry and harbor areas.