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{{globalize|article|us|reason=only in the US would you define a reach between arbitrary features; normally they are set by the physics of sail|date=December 2019}}
A '''reach''' is a lengthsegment of a stream, river, or river[[arm (geography)|arm]] of the sea,{{citation needed|date=April 2020}} usually suggesting a straight, level, uninterrupted stretch.<ref>Macfarlane, Robert, "Landmarks", Hamish Hamilton Press, 2015</ref><ref>Oxford English The beginning and ending points may be selected for geographicdictionary, historical or other reasons – and may be based on landmarks such as [[gauging station]]s''reach, [[river mile]]sn.'', naturalthird features,meaning and("part topography.{{dubious|date=Decemberof 2019}}<ref>[http://water.usgs.gov/wsc/glossary.html#Ra Hydrologicriver Definitions],which Sciencecan inbe Yourlooked Watershed,upon [[Unitedat Statesonce Geologicalbetween Survey|USGS]]</ref><ref>[http://www.streamnet.org/glossarystream.htmltwo Glossary: stream-related terms], StreamNetbends")</ref>
They are traditionally defined by the [[Point of sail#Reaching|capabilities of sailing boats]], as a stretch of a watercourse which, because it is straightish, can be sailed in one "[[Glossary of nautical terms (M-Z)#reach|reach]]" (that is, without [[Tacking (sailing)|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).
[[Image:Hanford Reach.jpg|right|thumb|Example: [[Hanford Reach National Monument]], Washington State, USA. The last significant free-running (undammed) section of the Columbia River in the US]]▼
[[File:River Thames Reaches.jpg|thumb|A map of the reaches of the River Thames; it can be seen that a reach is a straightish stretch (and can therefore be sailed in one [[:Wiktionary:reach#English|reach]], straight-line path between [[Tacking (sailing)|tacks]], unless the wind is too close to head-on to allow the sailing-boat to [[Point of sail#Reaching|reach]])]]▼
[[File:Barge Match (Thames River) RMG PY4069.tiff|thumb|[[Thames barge]]s reaching on the Thames during a race; they are probably on Gravesend Reach]]▼
 
A reach may also 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 [[Armarm, though an (geography)|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|date=April 2020}} The word may also be used more generally to refer to any extended portion or stretch of land or water, or even metaphorically.
 
* An extended portion or stretch of land or water;
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 station]]s, or simply the length of a watercourse between any two defined points.<ref>[http://water.usgs.gov/wsc/glossary.html#R Hydrologic Definitions], Science in Your Watershed, [[United States Geological Survey|USGS]]</ref><ref>{{cite web |title=Glossary: stream-related terms |archive-url=https://web.archive.org/web/20141207192549/https://www.streamnet.org/glossarystream.html|url=http://www.streamnet.org/glossarystream.html |website=Streamnet |date=7 December 2014|archive-date=2014-12-07}}</ref> These may be measured in terms of [[river mile]]s.
* a straight portion of a stream or river, as from one turn to another;
* a level stretch, as between locks in a [[canal]];
* an arm of the sea extending up into the land.
 
As of 2015, the [[US Board on Geographic Names]] records 334 place names in the US with the characterization of a named "reach".<ref>[http://geonames.usgs.gov/apex/f?p=136:2:12938640691775:pg_R_49974142591090605124:NO&pg_min_row=91&pg_max_rows=15&pg_rows_fetched=15 USGS Survey GNIS Database]</ref>
 
==Gallery==
<gallery>
▲[[Image:Hanford Reach.jpg|right|thumb|Example: [[Hanford Reach National Monument]], Washington State, USAUS. The last significant free-running (undammed) section of the Columbia River in the US]]
▲[[File:River Thames Reaches.jpg|thumb|A map of the reaches of the River Thames; it can be seen that a reach is a straightish stretch (and can therefore be sailed in one [[:Wiktionary:reach#English|reach]], one straight-line path between [[Tacking (sailing)|tacks]], unless the wind is too close to head-on to allow the sailing-boat to [[Point of sail#Reaching|reach]])]]
▲[[File:Barge Match (Thames River) RMG PY4069.tiff|thumb|[[Thames barge]]s reaching on the Thames during a race; they are probably on [[Gravesend#Gravesend and the River Thames|Gravesend Reach]]
</gallery>
 
==See also==
{{Wiktionary|reach}}
*[[RapidMeander]]▼
*[[Rapids|Rapid]]
*[[Stream pool]]
▲*[[Rapid]]
 
==References==
Retrieved from "https://en.wikipedia.org/wiki/Reach_(geography)"