Ramsar Site (Wetland of International Importance)

This dimension names any additional international recognition a protected area holds beyond its own country's designation, a World Heritage Site or a Biosphere Reserve, for example. Wikipedia notes that the IUCN's own categorisation method "is recognised on a global scale by national governments and international bodies such as the United Nations and the Convention on Biological Diversity," the same kind of cross border recognition this dimension records. Browsing by international designation groups areas that carry global, not just national, standing.