Kilburn is an area of north-west London, England, which is divided between three London Boroughs: most of Kilburn is in either Brent or Camden but a small section is inside Westminster. It is situated 3.75 miles (6.0 km) north-west of Charing Cross. The main thoroughfare running northwest-southeast is Kilburn High Road, part of the modern A5 road which forms the boundary between the boroughs of Brent and Camden. The road dates back to pre-Roman times and is part of the Roman road known as Watling Street. The town of Kilburn has its origins in a 12th-century priory on the banks of the Kilburn Brook. Kilburn today is a busy and multicultural London district. It has the highest Irish population of any London area, as well as a large Afro-Caribbean population. The area is identified in the London Plan as one of 35 major centres in Greater London.