A polder is a piece of reclaimed land, either from the sea or a lake. The principle 
is very simple. You build a big wall, or dyke, around the piece of land you want. 
Then you put quite a few big pumps inside the wall and pump the water out. 
Now you have a piece of relatively dry land. The problem is that the water seeps back 
under the dyke so you have to keep pumping. That is the reason why everywhere in 
The Netherlands there are canals. These collect the water which is then pumped into the sea. 
Windmills are used for this purpose sometimes. The small polder canals and ditches are 
usually teeming with Northern Pike, Yellow Perch and other 'coarse' fish.
A few impressions ...

Photography: Bert Scheers, Ben Beusker and Tom Vlastra.
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