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Florian Wittmann,1 Ethan Householder,2,3 Astrid de Oliveira Wittmann,4 Aline Lopes,2 Wolfgang J Junk,5 Maria TF Piedade2 1Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany; 2MAUA Working Group, National Institute for Amazon Research – INPA, Manaus, Brazil; 3Botanical Research Institute of Texas, Fort Worth, TX, USA; 4Institute for Biological Sciences, Federal University of Amazonas – UFAM, Manaus, 5National Wetland Institute – INAU, Cuiaba, Brazil Abstract: This review presents the current knowledge regarding South American wetlands and summarizes major outcomes of the implementation of the Ramsar Convention on Wetlands of International Importance for the South American continent. South America is the wettest continent on Earth, with wetlands accounting for ~20% of its area. Wetlands harbor an exceptional rich biodiversity also including many endemic plant and animal species. They provide numerous ecosystem services in terms of provisioning material goods, regulating biogeochemical cycles, providing habitat, sustaining cultural practices, and importantly, contributing to the maintenance and generation of regional biodiversity. Major threats to wetlands include agroindustrial expansion, deforestation, soil erosion, mining, pollution, inadequate resource use, and large infrastructural projects such as reservoir construction for hydropower. South American countries were slow in adopting definitions, delineations, and classifications of their wetlands and in inventorying wetlands according to their extent and ecological characteristics. However, Ramsar sites are increasing continuously in both numbers and extent, covering 113 sites, totaling an area of ~373,000 km2. Threats to wetlands and Ramsar sites are ongoing, mainly because of the lack of specific national wetland policies, limited financial and human resources, general lack of infrastructure, and limited monitoring capacity. The process of changing percep