WHS which consist of an entire and "living" mixed zone (i.e not just selected structures) of significant size (200 ha or greater) in the centre of a "Major" City (defined as having a "city" population - excluding surrounding "urban" and "metropolitan" areas - though definitions of this vary by country - of over 1 million people.) Size of inscribed areas are taken where available from UNESCO or approximated where missing. (City Population/Size of Inscribed Area)