The Royal Docks comprise three docks in east London - the Royal Albert Dock, the Royal Victoria Dock and the King George V Dock. They are more correctly called the Royal Group of Docks to distinguish them from the Royal Dockyards, Royal being due to their naming after royal personages rather than Crown ownership. The three docks collectively formed the largest enclosed docks in the world, with a water area of nearly 250 acres (1.0 km2) and an overall estate of 1,100 acres (4.5 km2). This is equivalent to the whole of central London from Hyde Park to Tower Bridge. The area was designated a special enterprise zone in 2011.