May not be stagnant, but could be called a Mortlake or an Oxbow lake
Sometimes a meandering river forms a feature called an oxbow lake. An oxbow lake is a meander that has been cut off from the river. An oxbow lake may form when a river floods. EW
Oxbow lake.
The Nile River does not have a significant number of oxbow lakes compared to other river systems, primarily due to its size and the nature of its flow. Oxbow lakes typically form in meandering rivers that have a slower flow, allowing for the creation of curved bends that can eventually become isolated. While some localized areas may exhibit this phenomenon, the Nile's characteristics and its extensive management through dams and irrigation limit the formation of oxbow lakes. Thus, specific data on the number of oxbow lakes along the Nile is not well-documented.
Oxbow lake
A river's flow tends to slow down on reaching a flat valley floor. It is here that the river may meander, creating bends and ox-bow lakes.
When a meander is cut off from the main river channel, it creates an oxbow lake. This landform is formed as sediment fills in the former meander loop, isolating it from the river. Over time, the oxbow lake may become a wetland or gradually dry out, depending on the local hydrology.
This is likely an oxbow lake, formed when a meander loop is cut off from the main river channel. The sand and gravel have been deposited in the oxbow lake due to reduced water velocity, creating a sediment buildup. Over time, vegetation may establish in the oxbow, further stabilizing the bank and bottom.
Naturally rivers erode & deposit silt & debris over time, millions of years, and this erosion will, by force of gravity, alter the course of the river. Where there is a large meander, a huge bend in the river course, erosion may be so dramatic that the meander will be cut & this will form a lake in the old river course. This type of semi cirular lake is called an Oxbow lake. It is a cut off meander.
an ox bow lake is a formation, not a single entertity. it occurs when a river meanders (horozontal erosion) and becomes so great that when the water seeks the fastest route- it cuts across the meander, naturally straightening the river chanel out again, and leaving a horse shoe shaped lake left on its own, which ususally matures into a lagoon or something. there is no 'the ox bow lake' there are 'ox bow lakes' doofus.
At times, particularly during floods, a river may form a meander cutoff, a new, shorter channel across the narrow neck od a meander. The old meander may be abandoned as sediment separates out from the new, shorter channel. The cutoff meander becomes a cresent-shaped ox-bow lake. With time, an ox-bow lake may be filled with sediment and vegitation.
A river usually flows quickly in the upper course, as it is at a higher elevation - mountains streams, waterfalls, etc. In the lower course, it will slow down as the lower elevation means the slope is more horizontal. It is here that the river may start to meander across the valley floor, forming bends, oxbow lakes, and a flood plain.