The Haringvliet, located in South Holland between Voorne-Putten and the Hoeksche Waard in the north and Goeree-Overflakkee in the south, is a former estuary of the North Sea . The Haringvliet was built in 1970 as part of the Delta Worksclosed from the sea by the Haringvlietdam. The Goereese lock was constructed near the dam for shipping. The Haringvliet Bridge runs from Hoeksche Waard to Hellegatsplein. The island of Tiengemeten is located in the Haringvliet. The Spui flows into the Haringvliet between Hoeksche Waard and Voorne-Putten. Before 1200 Voorne and Flakkee were one island, until in 1216 a storm surge broke through the natural dune coast and a gully was created that soon made its way through the peat an increasingly long way. The channel deepened and developed into an ever-broader sea arm, which extended further and further inland. After more than thirty years, around 1250, the Striene, a now no longer existing branch of the Scheldt towards the Maas, reached. The new estuary also extended east of the Striene where the Wijvekeen, the predecessor of the Hollandsch Diep, was formed. The name Haringvliet first appears in written sources in 1315. However, the Haringvliet was called Flakkee for centuries; only in the 19th century did the name Haringvliet become common.