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thalweg
In geography and fluvial geomorphology, a thalweg or talweg () is the line of lowest elevation within a valley or watercourse.〔(Webster Dictionary )〕 Under international law, thalwegs can acquire special significance because disputed river borders are often deemed to run along the river's thalweg.
==Etymology==
The word ''thalweg'' is of 19th-century German origin. The German word ''Thalweg'' (modern spelling ''Talweg'') is a compound noun that is built from the German elements ''Thal'' (since Duden's orthography reform of 1901 written ''Tal'') meaning ''valley'', and ''Weg'', meaning ''way.'' It literally means "valley way" and is used, with its modern spelling "Talweg," in daily German to describe a path or road that follows the bottom of a valley, or in geography with the more technical meaning also adopted by English.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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