London Wiki

South London in the current official London sub-regions

Normally taken to be that part of London south of the River Thames

According to the 2011 official Boundary Commission for England definition, - London 2011 amendment) the area includes the London boroughs of Bexley, Bromley, Croydon, Greenwich, Kingston, Lambeth, Lewisham, Merton, Richmond, Southwark, Sutton and Wandsworth.

Wikipedia page [1] refers.