A polder is a low-lying tract of land enclosed by embankments (barriers) known as 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:
- Land reclaimed from a body of water, such as a lake or the sea bed.
- Flood plains separated from the sea or river by a dike.
- Marshes separated from the surrounding water by a dike and consequently drained.
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