Saemangeum is an estuarine tidal flat on the coast of the Yellow Sea in South Korea
. It was dammed by the government of South Korea's Saemangeum Seawall
Project, completed in April 2006, after a long fight between the government and environmental activists, and is scheduled to be converted into either agricultural or industrial land. Prior to 2006, it had played an important role as a habitat for migratory birds.
The completion of this seawall is likely to be a major contributor to the decline of many species. Around 400,000 shorebirds depended on the Saemangeum estuarine as an important feeding ground on the 24,000 km migration between Asia
and Alaska and Russia
, including the two endangered waders Nordmann's Greenshank and Spoon-billed Sandpiper (each species with less than a thousand surviving birds). The Saemangeum lay at the mouths of the Dongjin and Mangyeong Rivers, on the coast of Jeollabuk-do. It is just south of the estuary of the Geum River
. Neighboring districts include Gunsan City, Buan County, and Gimje City.