Since 1981 UNEP-WCMC has ever since 1981 been compiling this information and making it available to the global community. This has been done through their Protected Areas Programme. The WDPA is a joint project of UNEP and IUCN, produced by UNEP-WCMC and the IUCN World Commission on Protected Areas working with governments and collaborating NGOs.
They describe their databases this way:
"The World Database on Protected Areas is a foundation dataset for conservation decision making. It contains crucial information from national governments, non-governmental organizations, academic institutions, international biodiversity convention secretariats and many others. It is used for ecological gap analysis, environmental impact analysis and is increasingly used for private sector decision-making."
Their website address is here: