The A226 road travels in a west–east direction in southeast London and north Kent, from Crayford in the London Borough of Bexley, through Dartford, Gravesend to Strood. It is about 15.7 miles in length.

Gravesend is a town in northwest Kent, England, situated 21 miles (35 km) east-southeast of Charing Cross on the south bank of the River Thames and opposite Tilbury in Essex. Located in the diocese of Rochester, it is the administrative centre of the borough of Gravesham. Gravesend marks the eastern limit of the Greater London Built-up Area, as defined by the UK Office for National Statistics. In 2021 it had a population of 58,102.