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A reach is a general term for a length of a stream or river, usually suggesting a level, uninterrupted stretch.〔Macfarlane, Robert, "Landmarks", Hamish Hamilton Press, 2015〕 The beginning and ending points may be selected for geographic, historical or other reasons - and may be based on landmarks such as gauging stations, river miles, natural features, and topography.〔(Hydrologic Definitions ), Science in Your Watershed, USGS〕〔(Glossary: stream-related terms ), StreamNet〕 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 arm. The term "reach" can also refer to: * An extended portion or stretch of land or water; * 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".〔(USGS Survey GNIS Database )〕 ==See also== *Stream pool *Rapid 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Reach (geography)」の詳細全文を読む スポンサード リンク
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