Thalweg
noun
1.
a line, as drawn on a map, connecting the lowest points of a valley.
2.
Chiefly International Law. the middle of the main navigable channel of a waterway that serves as a boundary line between states.
noun (geography, rare)
1.
the longitudinal outline of a riverbed from source to mouth
2.
the line of steepest descent from any point on the land surface
thalweg
(täl’věg’)
The line defining the lowest points along the length of a river bed or valley, whether underwater or not.
A subterranean stream following a course similar to that of an overlying surficial stream.
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