Kornwerderzand
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Kornwerderzand, or the Kornwerderzandstelling were a number of heavily fortified pillboxes/bunkers located at the eastern side of the Afsluitdijk in the Dutch province of Friesland.
During World War II, German troops were unable to penetrate this point, although having more and better equipment. This situation lasted until the surrender of the Dutch forces in The Netherlands (except Zeeland).