Central Breakwater
The Central Breakwater is a breakwater and artificial island located in Tokyo Bay, adjacent to the Tokyo Gate Bridge.
History
The Central Breakwater was first constructed in 1973 and has been used as a site for waste disposal from Tokyo since then, forming two artificial islands in Tokyo Bay known as the Inner Landfill and the Outer Landfill. The islands had a combined area of 377 hectares in 2011 and are expected to ultimately reach an area of 989 hectares.Jurisdiction dispute
Jurisdiction over the Central Breakwater islands was disputed between the special wards of Koto and Ota for 4 decades. Under Japanese law, any boundary dispute may be submitted to the prefectural government for resolution; a similar dispute with regard to the nearby Odaiba and Ariake area was resolved in 1982 by splitting the area between the three special wards that claimed it. Koto has argued that the garbage used to create the landfill was hauled through Koto and that making the island part of the special ward would repay residents for their trouble, while Ota has argued that the site of the breakwater was historically used by Ota-based nori cultivators, and that the island should be managed in coordination with nearby Haneda Airport. The dispute is mainly considered an issue of brand image; jurisdiction over the island offers little practical benefit to the special wards, as fixed asset taxes on real estate are collected by the metropolitan government.On October 3, 2019 Tokyo District Court ruled 79.3% of the Central Breakwater landfills to Kōtō Ward and 20.7% to Ōta Ward for multiple decades. Ota Ward stated that it won't appeal the ruling. Thus the 40 year dispute was closed.
From December 17 to January 31, 2020 the public made 532 proposals for the town name of the west side to be incorporated in Ota Ward. On 1 June 2020, Reiwajima became the official name. The east side of Koto Ward uses the name Sea Forest which they were accustomed to.