In the third installment of our series explaining the origins of the names of the areas of South London we will be focusing on the great London Borough of Southwark. Along with Lambeth, Lewisham and Greenwich it forms part of what we like to call the 'four shark teeth' of South London. We might have included Wandsworth in that list because it does look a little - actually a lot - like tiger shark tooth. Go on, search the boundaries of Wandsworth and then compare it against a tiger shark tooth. You'll see, you will all see. Anyway, less about fearsome fish and more about the reason behind the names of areas. Southwark is probably the installment we've looking forward to most because of some of the really curious names in the borough, like Denmark Hill or Elephant and Castle - frankly, we really cannot wait to explain it.