The London Borough of Brent is a London borough in north-west London. It borders the boroughs of Harrow to the north-west, Barnet to the north-east, Camden to the east, the City of Westminster to the south-east, as well as the Royal Borough of Kensington and Chelsea, Hammersmith and Fulham and Ealing to the south. Most of the eastern border is formed by the Roman road Watling Street, which is now the modern A5.