the Netherlands
Yes, in some cases you can build on reclaimed land. This will vary depending on which type of land is being reclaimed. Land that housed a garbage dump is often reclaimed for woodlands rather than for homes.
Land reclaimed from the sea is often referred to as reclamation land or land reclamation. It involves altering coastlines or waterways to create new land for various purposes such as urban development or agriculture.
in the Netherlands we call reclaimed land "polders"
polder
They reclaimed it from the North Sea, not land.
cambodia
Yes
Examples: Parts of Tuas are on reclaimed land. Jurong Island used to be two separate islands. The land between the islands was reclaimed to fuse them together.
Lands reclaimed by the sea can be called either land fills or reclamation ground. In New Zealand, it is called land rehabilitation.
It is Kansai Airport.
The Netherlands is particularly known for reclaiming territory from the sea, so that would be your answer. Some other countries have also reclaimed land to a lesser extent.
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.