thalweg

[tahl-veg, -veyk]
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.

Origin:
1860–65; < German, equivalent to Thal, now obsolete spelling of Tal valley (cognate with dale) + Weg way1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
thalweg or talweg (ˈtɑːlvɛɡ)
 
n
1.  the longitudinal outline of a riverbed from source to mouth
2.  the line of steepest descent from any point on the land surface
 
[C19: from German, from Thal valley + Weg way, path]
 
talweg or talweg
 
n
 
[C19: from German, from Thal valley + Weg way, path]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
thalweg   (täl'věg')  Pronunciation Key 
  1. The line defining the lowest points along the length of a river bed or valley, whether underwater or not.

  2. A subterranean stream following a course similar to that of an overlying surficial stream.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Not always able to push down deep enough to get cone below pile depth, but can
  compare to thalweg.
Where the thalweg crosses a riffle, the fastest flows along the brook may be
  found.
Pools typically form in the thalweg near the outside bank of bends.
Channel incisions within this incised valley comprise a complex integrated
  drainage network with multiple thalweg features.
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