Voorne aan Zee is a municipality on the island of Voorne-Putten in the western Netherlands, in the province of South Holland. The municipality covers an area of 189.82 km2 of which 67.99 km2 is water.

Vierpolders is a village in the Dutch province of South Holland. It is a part of the municipality of Voorne aan Zee, and lies about 5 km north of Hellevoetsluis.