Brielle (About this sound pronunciation ), also called Den Briel (Brill in English) is a town, municipality and historic seaport in the western Netherlands, in the province of South Holland, on the north side of the island of Voorne-Putten, at the mouth of the New Maas. The municipality covers an area of 31.14 km2 (12.02 sq mi) of which 3.58 km2 (1.38 sq mi) is water. In 2014 its population was 16,350.The municipality of Brielle also includes the communities Vierpolders and Zwartewaal.