Polders are land reclamation projects typically found in low-lying coastal areas, and they are often associated with the Netherlands. The term "polder" refers to a piece of low-lying land that has been enclosed by dikes or embankments to prevent it from flooding by the sea or rivers. Polder systems typically involve a complex network of dikes, canals, and drainage systems to control water levels.
In the Netherlands, polders have been used for centuries to expand arable land and protect it from the threat of flooding, as much of the country is situated below sea level. The Dutch are renowned for their expertise in water management and have successfully reclaimed vast areas of land from the sea, making it suitable for agriculture and human habitation.
Polder systems are not exclusive to the Netherlands, and you can find similar land reclamation projects in other countries with low-lying coastal regions facing the risk of flooding. These projects are often vital for increasing available land for agriculture, housing, and infrastructure development in areas prone to inundation.