Land reclamation in the Netherlands has a long history. As early as in the 14th century, the first reclaimed land had been settled.[1] Much of the modern land reclamation has been done as a part of the Zuiderzee Works since 1919.[2]
According to a 2007 study by Calvin University in the USA, about 65% of the country would be under water at high tide if it were not for the existence and the country's use of dikes, dunes and pumps.[3] Land reclamation in the 20th century added an additional 1,650 square kilometres (640 sq mi) to the country's land area.[3] Of the country's population, 21% lives in the 26% of the land located below mean sea level.[4]