Polder: A polder is an area of land that has been reclaimed from bodies of water, such as lakes or seas. This process involves building dikes (walls) around the area and pumping out water to create usable land.
Canals: Canals are man-made waterways that are used for transportation, irrigation, drainage, or defense purposes. In the case of the Netherlands, canals play a significant role in managing water levels and controlling flooding.
Dikes: Dikes are walls or embankments built along rivers or coastlines to prevent flooding by holding back water. The construction of dikes is essential in countries like the Netherlands with low-lying land susceptible to inundation.