27. Saemangeum Seawall-Vyn-131008-1548.jpg
The 33 km long Saemangeum Seawall, completed in 1996, is the largest seawall in the world. It blocked off one of the most productive estuarine systems in the Yellow Sea, destroying critical migratory stopover habitat for the Spoon-billed Sandpiper and other migratory bird species. Saemangeum, South Korea. October.