Etymology
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thalweg (n.)

1831, from German Thalweg "path along the bottom of a valley," from thal (see dale) + weg "road, path" (see way (n.)).

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Definitions of thalweg

thalweg (n.)
the middle of the chief navigable channel of a waterway that forms the boundary line between states;
thalweg (n.)
a line following the lowest points of a valley;
From wordnet.princeton.edu