
1) Bound 2) Boundary 3) Edge 4) German geographic term 5) Water stream
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https://www.crosswordclues.com/clue/thalweg

In geography and fluvial geomorphology, a thalweg or talweg (ɡ) 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. The word thalweg is of Germanic origin and literally means `valley co.....
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http://en.wikipedia.org/wiki/Thalweg

middle of navigable waterway used as boundary line
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http://phrontistery.info/t.html

• (n.) The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles. • (n.) A line following the lowest part of a valley, whether under water or not.
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http://thinkexist.com/dictionary/meaning/thalweg/

(1) The lowest thread along the axial part of a valley or stream channel. (2) A subsurface, ground-water stream percolating beneath and in the general direction of a surface stream course or valley. (3) The middle, chief, or deepest part of a navigable channel or waterway.
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http://www.encyclo.co.uk/local/21804

A sinuous imaginary line following the deepest part of a stream.
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http://www.encyclo.co.uk/local/22392
Thal'weg` noun [ G., from
thal valley +
weg way. See
Dale ;
Way .]
(Physiography) (a) A line following the lowest part of a valley, whether under water or not.
(b) The line of continuous maximum descent from any point on a land surface, or tha...
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http://www.encyclo.co.uk/webster/T/37

Line of deepest water in a stream channel as seen from above. Normally associated with the zone of greatest velocity in the stream.
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http://www.physicalgeography.net/physgeoglos/t.html

Thalweg is a term of German origin signifying the lowest contour line of a valley, and therefore the natural direction of a stream or dried watercourse.
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http://www.probertencyclopaedia.com/browse/AT.HTM

A sinuous imaginary line following the deepest part of a stream.
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http://www.scientificpsychic.com/etc/geology-glossary.html

[
n] - the middle of the chief navigable channel of a waterway that forms the boundary line between states 2. [n] - a line following the lowest points of a valley
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http://www.webdictionary.co.uk/definition.php?query=thalweg

The line down the center of the main CHANNEL of a stream.
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https://www.encyclo.co.uk/local/20127
noun a line following the lowest points of a valley
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https://www.encyclo.co.uk/local/20974
No exact match found.