The Dongcheon Estuary refers to an expanse of 5.28 million square meters in an area featuring vast reed fields and paddy wetlands. The area is visited by 237 species of birds every year, including some 30 endangered species. It is visited by the most number of avian species among Korea's wetlands. The wetland's biological diversity has been recognized and the Dongcheon Estuary was named a Ramsar site. The site includes the marshes around the estuary and nearby rice paddies, forming an ecological sphere that stretches from Suncheon's inland area to its coast. Choi Jong-won(Official, Ministry of Environment) : "We've set up a protective system that connects the coastal wetland of Suncheon Bay and the inland wetland of the Dongcheon Estuary. It's meaningful that the area's importance was internationally recognized."
Since the Dongcheon Estuary includes the country's largest paddy wetland, the Ramsar designation is expected to help preserve the habitat for migratory birds. With the addition of the Dongcheon Estuary, there are now 22 sites in Korea recognized as a wetland of international importance as defined by the Ramsar Convention.