详细解释:【法】 航道分界线
英语解释：
名词 thalweg:
the middle of the chief navigable channel of a waterway that forms the boundary line between statesa line following the lowest points of a valley详细解释：
thal.weg
n.Geology （名词）【地质学】 The line defining the lowest points along the length of a river bed or valley.河流谷底线：延着整条河床或河谷长度，用来界定最低点的线A subterranean stream.地下溪流
来源：German German Tal, Thal [valley] from Middle High German tal from Old High German Tal, Thal [valley] from Middle High German tal from Old High German Weg [way] from Middle High German wec, weg from Old High German weg * see wegh- Weg [way] from Middle High German wec, weg from Old High German weg *参见 wegh-