Artificial landforms

thumb|Aerial view of Flevopolder, the [[Netherlands]] alt=|thumb|Satellite imagery|Satellite image of [[Noordoostpolder, the Netherlands (595.41 km2)]] A polder () is a low-lying tract of land that forms an artificial hydrological entity, enclosed by embankments known as dikes. The three types of polder are:

form of art creation in which landscape and the work of art are inextricably linked

agricultural formation consisting of a slope cut into a series of receding flat surfaces or platforms

thumb|Embankment dam with two berms

thumb|Terp on the hallig of Hooge thumb|Halligwarft während einer Sturmflut, "Hallig terp during a storm tide"; a dramatic 1906 illustration thumb|1862 illustration thumb|Westerwerft on Hooge, Germany|Hallig Hooge thumb|Hallig Gröde from the East, showing the Kirchwarft and the Knudswarft (mouseover markings) thumb|On Hamburger Hallig A terp, also known as a wierde, woerd, warf, warft, werf, werve, wurt or værft, is an artificial dwelling mound found on the North European Plain that has been created to provide safe ground during storm surges, high tides and sea or river flooding. The various t

artificial wetland to treat municipal or industrial wastewater, greywater or stormwater runoff

civil engineering term; the work of ensuring a level base, or one with a specified slope, for a construction work

architecture resembling a drop in a river's course