The '''Amer''' is a river in the [[Netherlands|Dutch]] [[Provinces of the Netherlands|province]] of [[North Brabant]]. It is a continuation of the [[Bergse Maas]] [[river]] from the river [[Donge (river)|Donge]] near Raamsdonksveer to the point where it joins the river [[Nieuwe Merwede]] to form the [[Hollands Diep]] estuary, and has a total length of approximately {{convert|20|km|mi|0}}. The Amer is a major navigation route. It forms the south boundary of the [[Biesbosch National Park]].
In 1886, the splitting of the MassMaas and of the [[Waal (river)|Waal]] made the Amer the mouth of the Maas.<ref>{{Cite journal |lastlast1=Cox |firstfirst1=J. R. |last2=Huismans |first2=Y. |last3=Knaake |first3=S. M. |last4=Leuven |first4=J. R. F. W. |last5=Vellinga |first5=N. E. |last6=van der Vegt |first6=M. |last7=Hoitink |first7=A. J. F. |last8=Kleinhans |first8=M. G. |date=July 2021 |title=Anthropogenic Effects on the Contemporary Sediment Budget of the Lower Rhine‐MeuseRhine-Meuse Delta Channel Network |url=https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020EF001869 |journal=Earth's Future |language=en |volume=9 |issue=7 |doi=10.1029/2020EF001869 |bibcode=2021EaFut...901869C |hdl=1874/412770 |s2cid=236315260 |issn=2328-4277|hdl-access=free }}</ref> Before anthropogenic actions in the early 1900s, salmon used to reach the Bergse Maas through the Amer.<ref>{{Cite journal |last=de Groot |first=S.J. |date=April 1989 |title=Literature survey into the possibility of restocking the River Rhine and its tributaries with Atlantic salmon (SALMO SALAR). |page=14 |url=https://edepot.wur.nl/326238 |journal=NETHERLANDSNetherlands INSTITUTEInstitute FORfor FISHERYFishery INVESTIGATIONSInvestigations (RIVORivo)}}</ref>
The river is also known because the [[Amercentrale]], one of the biggest [[power plant]]s in the Netherlands, is located on its bank. As a result, ships transporting [[coal]] for the plant use the eastern part of the river, mainly coming from the [[Wilhelmina Canal]].
