this is true.
in the Netherlands we call reclaimed land "polders"
polder
A polder
Canals are man made water ways used in different ways in Holland, or more accurately, Netherlands. They were dug around a lake, a dyke was build in between and the water out of the lake was pumped into the canal. The reclaimed land from the lake is then known as a "polder". The canals are usually linked up with other waterways and canals and pump houses can the regulate the water levels. Canals are also used for irrigation for the reclaimed land and a way of transport, as the produce could easily be transported with a "praam" (flat boat). They are also great for ice skating in winter and as most canals are connected with other water ways, you can easily cover 20 to 200-km on your skates. Hope that answered your question. From a Dutch "polder girl"
polder
Polders are areas of low-lying land that have been reclaimed from the sea or rivers and are protected by dikes or walls to prevent flooding. They are common in countries like the Netherlands and are used for agriculture or residential purposes. Drainage systems are essential to keep polders dry and usable.
Constructing a perimeter dike to hold back water. Draining the enclosed area using windmills or modern pumping systems. Ensuring proper water management through a system of canals and ditches. Establishing a ground level that allows for agricultural or residential use within the polder.
Former bodies of water like lakes where they reclaimed the land by pumping out the water. The entire province of Flevoland is a polder. It used to be a sea. The sea became a lake when they build a large dike called the afsluitdijk. Later they surrounded a large part of the water with dikes and pumped out the water thus creating land that is below sea level. Of the dutch landmass approx one third is below sea level.
I don't really know what 'land that was reclaimed' you mean, there are multiple areas where first was water and now is land. But if you mean "de Zuiderzee", there where first was sea and now is land (the biggest area that was reclaimed): The Dutch build a big dike (called "de Afsluitdijk"), making "de Zuiderzee" a lake and no longer a part of the sea. This lake, which was and still is called "het IJsselmeer" isn't completely made into land however, only some of the southern parts and some other smaller parts around the lake. These southern parts of the former "Zuiderzee" that now lie there are called "Flevoland" and the "Noordoostpolder". And if you simply mean how any reclaimed land would be called in the Netherlands, they usually call it a polder. I hope this answers the question.
Empoldering is a technique used to create new land by draining water from marshy or wet areas to reclaim it for agricultural or developmental purposes. This process involves building dikes or embankments to prevent water from re-entering the reclaimed land. Empoldering has been historically important in areas with abundant water resources for creating arable land and expanding settlement areas.
That land is called a polder. Polders are created by draining water from low-lying areas, typically with the help of dikes and pumps. They are common in countries with extensive low-lying areas like the Netherlands.
Polders are typically found in low-lying coastal areas that have been reclaimed from the sea. They are commonly seen in countries like the Netherlands.