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The 'Brielse Meer' ("Lake Den Briel") is a long, narrow lake between the Dutch estuary islands of Voorne and Rozenburg in the province of Zuid-Holland.
The lake takes its name from Den Briel, a town on its shore. It was formerly a Meuse branch known as Brielse Maas (Den Briel Meuse), which ran from the Botlek strait near Rotterdam into the North Sea. The first stretch, between Botlek and the former confluence with the Het Scheur branch, was alternatively known as (the last stretch of) Nieuwe Maas.
When the Brielse Maas silted up in the late nineteenth century, the Nieuwe Waterweg ship canal was constructed (1872) and Het Scheur was separated from the Brielse Maas by a dam. As a to the Delta Works sea barrier constructions, the Brielse Maas was closed off at both ends in 1950, becoming the Brielse Meer.