A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention,[1] also known as "The Convention on Wetlands", an international environmental treaty signed on 2 February 1971 in Ramsar, Iran, under the auspices of UNESCO. It came into force on 21 December 1975, when it was ratified by a sufficient number of nations. It provides for national action and international cooperation regarding the conservation of wetlands, and wise sustainable use of their resources.[1] Ramsar treaty participants meet regularly to identify and agree to protect "Wetlands of International Importance", especially those providing waterfowl habitat.
As of July 2025, there are at least 2,544 Ramsar sites around the world, protecting 257,317,367 hectares (635,845,060 acres), and 172 national governments are participating.[1]