Brielle, also calle Den Briel (Brill in English) is a town and municipality in the western Netherlands, in the province of South Holland, on the north side of the island of Voorne, at the mouth of the New Maas. The municipality covers an area of 31.12 km² (12.02 mile²) of which 3.63 km² (1.40 mile²) is water. In 2004 its population was 15,948.