Reach (geography)

The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. The specific issue is: only in the US would you define a reach between arbitrary features; normally they are set by the physics of sail You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. (December 2019) (Learn how and when to remove this template message)

A reach is a segment of a stream, river, or arm of the sea,^{[citation needed]} usually suggesting a straight, level, uninterrupted stretch.^[1][2] They are traditionally defined by the capabilities of sailing boats, as a stretch of a watercourse which, because it is straightish, can be sailed in one "reach" (that is, without tacking).

Reaches are often named by those using the river, and a reach may be named for landmarks, natural features, and historical reasons (see, for instance, Gallions' Reach, named after the family that once owned its banks).

A reach may be an expanse, or widening, of a stream or river channel. This commonly occurs after the river or stream is dammed. A reach is similar to an arm, though an arm may bend and thus have multiple reaches. The term "reach" can also refer to a level stretch, as between river rapids or locks in a canal.^{[citation needed]} The word may also be used more generally to refer to any extended portion or stretch of land or water, or even metaphorically.

In fluvial hydrology, a reach is a convenient subdivision of study; it may be any length of river of fairly uniform characteristics, or the length between gauging stations, or simply the length of a watercourse between any two defined points.^[3][4] These may be measured in terms of river miles.

As of 2015, the US Board on Geographic Names records 334 place names in the US with the characterization of a named "reach".^[5]