1872 and the Eastern Counties and Thames Junction Railway was extended to Beckton in 1873, and Gallions in 1880. The London, Tilbury and Southend Railway connected Barking with Dagenham, Hornchurch and Upminster in 1885, and Romford with Upminster in 1893. The final piece of original railway works was the construction of the Great Eastern loop line to connect Woodford with Ilford via Fairlop in 1903. Areas further east developed in the Victorian and Edwardian eras after the expansion of the railways in the 19th century. Development of suburban houses for private sale was later matched by the provision of large-scale social housing at Becontree in the 1920s and Harold Hill after the Second World War. However, the urban footprint was constrained in 1878 by the protection of Epping Forest and later the implementation of the Metropolitan Green Belt. The density of development increased during the interwar period, and new industries developed, such as Ford at Dagenham. Industrial decline and regeneration The industries declined in the later part of the 20th century (and earlier), but East London is now an area of regeneration. London Docklands was defined in the 1980s as the area of redevelopment under the control of the London Docklands Development Corporation. The Thames Gateway extends into East London with two areas of activity: the Lower Lea Valley around the Olympic site and London Riverside adjacent to the Thames. Governance There are seven London boroughs that cover areas of Greater London to the north of the Thames and east of the City of London. They are Barking and Dagenham, Hackney, Havering, Newham, Redbridge, Tower Hamlets and Waltham Forest. Each London borough is governed by a London borough council local authority. Barking and Dagenham, Hackney, Havering, Newham and Redbridge are members of the East London Waste Authority. Some local government functions are held by the Greater London Authority, made up of the Mayor of London and the London Assembly. Geography East London is located in the lower Thames valley. The major rivers of East London are the Thames that forms the southern boundary; the Lea which forms the boundary of Tower Hamlets/Hackney with Newham/Waltham Forest; the Roding which approximately forms the boundary of Newham with Barking and Dagenham/Redbridge; and the Beam which forms the boundary of Barking and Dagenham with Havering. The marshes along the Thames which once stretched from Wapping to Rainham are almost completely gone. East London is