Oude Maas
The Spui is a small tidal river in South Holland in the Netherlands, separating the islands of Voorne-Putten and Hoeksche Waard. Historically, it forked off the Oude Maas river at the town of Oud-Beijerland to end in the Haringvliet estuary, but as a (planned) result from the Delta Works, its flow has been reversed.