Saemangeum
The 928th tallest dam in the world
Saemangeum (Korean pronunciation: [sɛmanɡɯm]) 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 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 2010, it had played an important role as a habitat for migratory birds.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).