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A backwater is a part of a river in which there is little or no current. It refers either to a branch of a main river, which lies alongside it and then rejoins it, or to a body of water in a main river, backed up by an obstruction such as the tide or a dam.

If a river has developed one or more alternative courses in its evolution, one channel is usually designated the main course and secondary channels may be termed backwaters. The main river course will usually have the fastest stream and will likely be the main navigation route, but backwaters may be more shallow and flow more slowly, if at all. This results in a more diverse environment of scientific interest and worthy of preservation. Backwaters also provide opportunities for leisure activities such as canoeing and fishing.

In this sense, the term is extended to apply to physical and social areas that have been bypassed. It may apply to places that have been neglected in economic development or in the expression a "cultural backwater".

When a section of a river is near the coast or another feature that sets its base level, the section influenced by the conditions at its mouth is termed a backwater. If a river flows into a lake or sea, it is the region in which the slope of the river decreases because the lower water flux permitted at the mouth causes the water to back up. Where the river outlet is strongly affected by tides, the cyclic change in base level changes the portion of the river that is a backwater. As a result, fresh and salt water may become mixed to form an estuarine environment.



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