Bergse Maas in the context of "History of Dutch orthography"

The Nieuwe Merwede (Dutch pronunciation: [ˌniu.ə ˈmɛrʋeːdə]; "New Merwede") is a Dutch canal, mainly fed by the river Rhine, that was constructed in 1870 to form a branch in the Rhine–Meuse delta. It was dug along the general trajectories of a number of minor Biesbosch creeks to reduce the risk of flooding by diverting the water away from the Beneden Merwede, and to facilitate navigation and regulate river traffic in the increasingly silted-up delta.

It is one of several rivers called Merwede. The most upstream is the river Boven Merwede ("Upper Merwede"), itself the continuation of the Rhine-Waal river and, until 1904, the Meuse (now the closed-off Afgedamde Maas) as well. The Boven Merwede branches near the town of Hardinxveld-Giessendam into River Beneden Merwede ("Lower Merwede") to the northwest and the Nieuwe Merwede to the southwest. The Nieuwe Merwede joins River Bergse Maas near Lage Zwaluwe to form the Hollands Diep estuary, and separates the Island of Dordrecht from the Biesbosch National Park.

The Merwede (Dutch pronunciation: [ˈmɛrʋeːdə]; etymology uncertain, possibly derived from the Old Dutch merwe or merowe, a word meaning "wide water") is the name of several connected stretches of river in the Netherlands, between the cities of Woudrichem, Dordrecht and Papendrecht. The river is part of the Rhine–Meuse–Scheldt delta and is mostly fed by the river Rhine.

At first, a disconnected branch of the Meuse joins the Waal at Woudrichem to form the Boven Merwede (Upper Merwede). A few kilometers downstream it splits into the Beneden Merwede (Lower Merwede) on the right and the Nieuwe Merwede (New Merwede) on the left. All these rivers are tidal. The Nieuwe Merwede joins the Bergse Maas near Lage Zwaluwe to form the Hollands Diep estuary, and separates the Island of Dordrecht from the Biesbosch National Park. The Beneden Merwede splits into the Noord River and Oude Maas near Papendrecht.

The Afgedamde Maas (Dutch pronunciation: [ˌɑfxədɑmdə ˈmaːs]; Dammed-up Meuse) is a former distributary of the Maas River (French: Meuse) in the Dutch provinces of North Brabant and Gelderland. The Maas splits near Heusden with one channel flowing north until its confluence with the river Waal (the main distributary of the river Rhine) to form the Merwede, while the other channel (the Bergse Maas) continues west as the main distributary of the Maas.