South London is the name for the boroughs of London in the south of the city. This has been defined as follows: Either the area is south of the River Thames, or by its postcode, it belongs to an district south of the River Thames. Postcodes of such areas either start with SE or SW. South London covers the London Boroughs of Bexley, Bromley, Croydon, Greenwich, Kingston, Lambeth, Lewisham, Merton, Richmond, Southwark, Sutton and Wandsworth. According to the London Plan, the boroughs Bexley, Greenwich, Lewisham, Bromley and Southwark make up Southeast London, and the others are Southwest London. Around 2.8 million people live in South London, of a total population of 8.8 million people for all of London.