A portion of an abandoned stream channel that is cut off from the rest of the stream is called a thalweg.

Name: A portion of an abandoned stream channel that is cut off from the rest of the stream is called a thalweg.
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A thalweg is actually the line of lowest elevation within a stream channel, typically where the main flow of water occurs. A portion of an abandoned stream channel is called a oxbow lake or meander scar.

A Portion of an Abandoned Stream Channel That Is Cut