A meander is a naturally-occurring loop-like bend in the course of a river will wind round any obstacle, such as hard rock. Once a meander has been
created it will continue, becoming accentuated by the erosive action of
the river. On the outside of a bend there will be lateral corrasion,
which will gradually work out sideways. On the inside of the bend there
is likely to be some deposition, which will build up a flat flood
plain. Meanders gradually move downstream. Sometimes they make complete
loops, which when cut off, form oxbow lakes.
The name comes from the winding River Maeander in Asian Turkey.