<P> A polder (Dutch pronunciation: (ˈpɔldər) (listen)) is a low - lying tract of land enclosed by dikes that forms an artificial hydrological entity, meaning it has no connection with outside water other than through manually operated devices . There are three types of polder: </P> <Ol> <Li> Land reclaimed from a body of water, such as a lake or the sea bed </Li> <Li> Flood plains separated from the sea or river by a dike </Li> <Li> Marshes separated from the surrounding water by a dike and subsequently drained; these are also known as koogs especially in Germany </Li> </Ol>

A low-lying land that has been reclaimed and is protected by dikes (especially in the netherlands)