The Ramsar Convention on Wetlands of International Importance Especially as Waterfowl Habitat is an international treaty for the conservation and sustainable use of wetlands.
[1] Adopted in 1971, it entered into force in 1975 and as of April 2022 had 172 contracting parties.
[1] Japan was the twenty-fourth party to accede, on 17 October 1980.
[2] Kushiro-shitsugen was the first of Japan's fifty-three Ramsar sites as of April 2022, with a total surface area of 1,552 square kilometres (599 sq mi).
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