London boroughs
The London boroughs are the 32 local authority districts that together with the City of London make up the administrative area of Greater London, England; each is governed by a London borough council. The present London boroughs were all created at the same time as Greater London on 1 April 1965 by the London Government Act 1963 and are a type of local government district. Twelve were designated as Inner London boroughs and twenty as Outer London boroughs. The City of London, the historic centre, is a separate ceremonial county and sui generis local government district that functions quite differently from a London borough. However, the two counties together comprise the administrative area of Greater London as well as the London Region, all of which is also governed by the Greater London Authority, under the Mayor of London.
https://en.wikipedia.org/wiki/London_boroughs