The London Borough of Brent is a London borough in north west London, UK and forms part of Outer London. It borders Harrow to the northwest, Barnet to the northeast, Camden to the east and Ealing, Hammersmith & Fulham, Kensington & Chelsea and Westminster to the south. Most of the eastern border is formed by the Roman road "Watling Street", now the modern A5. According to the 2001 census, the Borough of Brent has the country's highest percentage of people born outside of the UK (46.53%).