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The Collaborative International Dictionary
Thalweg

Thalweg \Thal"weg`\, n. [G., fr. thal valley + weg way. See Dale; Way.] (Physiography)

  1. A line following the lowest part of a valley, whether under water or not.

  2. The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles.

Douglas Harper's Etymology Dictionary
thalweg

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

Wiktionary
thalweg

n. (context geology geography English) The line that connects the lowest points in a valley or river channel, and thus the line of fastest flow along a river’s course.

WordNet
thalweg
  1. n. the middle of the chief navigable channel of a waterway that forms the boundary line between states

  2. a line following the lowest points of a valley

Wikipedia
Thalweg

In geography and fluvial geomorphology, a thalweg or talweg is the line of lowest elevation within a valley or watercourse. Under international law, thalwegs can acquire special significance because disputed river borders are often deemed to run along the river's thalweg.

Usage examples of "thalweg".

The dates form a kind of square with a sharp triangle to the south, upon the left bank of the thalweg, which overflows them during floods.

In the early 1970s, Iraqi casualties from the renewed warfare with the Kurds were such as to induce Saddam Husayn to sign an agreement with the shah of Iran in Algiers in March 1975 recognizing the thalweg, or the midpoint of the Shatt al Arab, as the boundary between the two countries.