“For the purposes of effective protection of the nominated property, a buffer zone is an area surrounding the nominated property which has complementary legal and/or customary restrictions placed on its use and development to give an added layer of protection to the property. This should include the immediate setting of the nominated property, important views and other areas or attributes that are functionally important as a support to the property and its protection. The area constituting the buffer zone should be determined in each case through appropriate mechanisms. Details on the size, characteristics and authorized uses of a buffer zone, as well as a map indicating the precise boundaries of the property and its buffer zone, should be provided in the nomination.”
“Although buffer zones are not part of the nominated property, any modifications to or creation of buffer zones subsequent to inscription of a property on the World Heritage List should be approved by the World Heritage Committee using the procedure for a minor boundary modification (see paragraph 164 and Annex 11). The creation of buffer zones subsequent to inscription is normally considered to be a minor boundary modification.”
“If a State Party wishes to significantly modify the boundary of a property already on the World Heritage List, the State Party shall submit this proposal as if it were a new nomination (including the requirement to be previously included on the Tentative List – see paragraph 63 and 65). This re-nomination shall be presented by 1 February and will be evaluated in the full year and a half cycle of evaluation according to the procedures and timetable outlined in paragraph 168. This provision applies to extensions, as well as reductions.”
188.8.131.52 - Significant modifications to the boundaries
“[For a nomination to be considered as “complete”, the following requirements (see format in Annex 5) are to be met:] (…) In section 3.2, a comparative analysis of the nominated property in relation to similar properties, whether or not on the World Heritage List, both at the national and international levels, shall be provided. The comparative analysis shall explain the importance of the nominated property in its national and international context."
7. "[The World Heritage Committee] decides that comparative analyses by States Parties as part of the nomination dossier shall be undertaken in relation to similar properties, whether or not on the World Heritage List, both at the national and international levels."
The World Heritage Committee recommends undertaking a deep comparative analysis in order to demonstrate the Outstanding Universal Value of the property by fully assessing the relative values of the nominated property against other sites (based on Case law on decisions on Nominations).