Oude Maas
Many Rhine-Meuse delta branches that were closed off from the main rivers and served as drainage bodies of the Grote Waard, also disappeared. These include the Dubbel (the name of which survives in Dubbeldam), Eem, Werken (after which Werkendam is named), Graaf, Alm (which lent its name to Almkerk; the eastern part survived) and most of the main drainage stream: the Oude Maas (a small part survives in the form of the Oude Maasje, not to be confused with another branch called Oude Maas near Rotterdam).