Sluice gates, which are parts of a 33 km-long sea dyke and shut out ocean waters, are seen at the Saemangeum land reclamation project area in Gunsan, about 200 km (124 miles) south of Seoul, November 12, 2008. South Korea is betting a multi-billion dollar land reclamation project about seven times the size of Manhattan will lift the economy but environmentalists say it could be one of the country's biggest ecological blunders. The Saemangeum land reclamation project uses a 33 km (20.5 mile) sea dyke to reclaim an area of 400 square kms (155 sq miles), turning coastal tidelands that are key feeding areas for globally threatened birds into land for factories, golf courses and water treatment plants. To match feature KOREA-ENVIRONMENT/ REUTERS/Jon Herskovitz (SOUTH KOREA)