Tag:place=polder
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 place = polder
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A land area that forms an artificial hydrological entity enclosed by embankments and usually is under sea level.  
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| Group: places |
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| Status: in use |
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Polders 
Polder are land areas that form artificial hydrological entitys, enclosed by embankments. Most polders are in the Netherlands and the middle and lower reaches of the Yangtze River Basin. In the Netherlands, polders usually are under sea level, with canals and pumping stations to drain water. Historically, pumping stations were windwills. Most modern pumping stations have electric pumps.
This tag is the result of a talk https://community.openstreetmap.org/t/taggen-van-polders/9309 that concludes that this is the best way to define polders in OSM.
Photos
Pumping station (the polder is on the right side, several meters under the canal).
Haskerveenpolder
Watergate on the embankment of Dieksanderkoog near Friedrichskoog for boat access
