Hellevoetsluis ; population: 38,778 in 2017) is a small city and municipality on Voorne-Putten Island in the western Netherlands, in the province of South Holland. The municipality covers an area of 46.27 km2 of which 14.71 km2 is water and it includes the population centres Nieuw-Helvoet, Nieuwenhoorn and Oude en Nieuwe Struiten, all former municipalities.
Hellevoetsluis is located on the Haringvliet with the sea, beach and dunes close by, on the extreme southern edge of the Rijnmond and Europoort areas, close to the broad Zeeland landscape. The name translates as "lock at the foot of the Helle". The Helle was a small local river which disappeared over time.
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