from that tributary's headwater to its mouth where it discharges into the river or stream, is the main stem of the river or stream in question.

Definition

The United States Geological Survey (USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream". As

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