The polder - unique landscape under sea level

The Netherlands is known for its polders. Approximately one third of the Netherlands lies under sea level. Dams, dikes and sluices keep the water out, and pumping stations ensure that the groundwater remains at safe levels. This water level is expressed NAP (Normaal Amsterdams Peil -- Normal Amsterdam Water Level).

• #education
• #polder
• #zuiderzee_automatiek
• #vending_machine
• #nap
• #zuiderzee_museum