It is Kansai Airport.
Reclaimed land.
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.
in the Netherlands we call reclaimed land "polders"
polder
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.
Reclaimed building materials can be found in many places. The best place to look is a junk yard where people have sold or lost their materials are now being resold.
Land that is reclaimed by diking and draining is called a Polder
ondergelopen grond
The Netherlands
The Zuider Zee, until it was reclaimed from the sea.