Two natural monuments, Markovi Kuvi and Cave Slatinski Izvor, are on the Tentative List of World Heritage Sites. Lake Prespa and Lake Dojran were designated Wetlands of International Importance (Ramsar sites) in 1995 and 2007, respectively, while Lake Ohrid has been proposed as a Ramsar site. One requirement for accession of the former Yugoslav Republic of Macedonia to the EU is the establishment of a network of Natura 2000 sites.