Maysor (Irtysh basin)

Maysor refers to a specific type of oxbow lake found within the Irtysh River basin, primarily in Western Siberia, Russia, and parts of Kazakhstan. It is a characteristic feature of the Irtysh floodplains and represents a stage in the natural evolution of river channels and their associated landforms.

Maysors are formed when the Irtysh River, a meandering river with a wide floodplain, cuts through the neck of a meander loop during periods of high water or flooding. This process isolates the loop from the main river channel, creating a crescent-shaped lake or backwater.

Over time, the connection to the main river channel may become increasingly restricted due to sedimentation. The Maysor then gradually evolves into a more isolated water body, often becoming shallower and smaller through evaporation and the accumulation of organic matter. The water quality in maysors can vary greatly depending on the level of connection to the Irtysh River, the surrounding land use, and seasonal variations.

These lakes are important components of the Irtysh River ecosystem, providing habitat for a variety of fish, waterfowl, and other wildlife. They also play a role in flood control and water storage within the floodplain. The specific characteristics of a Maysor, such as its size, depth, and water quality, can vary significantly depending on its age, location, and hydrological connection to the river. They are frequently used for fishing and other recreational activities by local populations.