The borough was formed by merging the former area of the Essex county borough of East Ham and the county borough of West Ham as a borough of the newly formed Greater London, on 1 April 1965 - these in turn were successors to the ancient civil and ecclesiastical parishes of East Ham and West Ham. Green Street and Boundary Road mark the former boundary between the two. North Woolwich also became part of the borough (previously being in the Metropolitan Borough of Woolwich, south of the river Thames in the County of London) along with a small area west of the River Roding which had previously been part of the Municipal Borough of Barking. Newham was devised for the borough as an entirely new name.^[3]