Westvoorne (About this sound pronunciation ) is a municipality on the island Voorne-Putten in the western Netherlands, in the province of South Holland. The municipality covers an area of 97.48 km2 (37.64 sq mi) of which 44.25 km2 (17.09 sq mi) is water. It had a population of 14,013 in 2014.The municipality of Westvoorne was formed on 1 January 1980, through the merger of the former municipalities of Oostvoorne and Rockanje.