The line defining the lowest points along the length of a river bed or valley.
A subterranean stream.
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.
Origin of thalweg
- German Talweg, Thalweg Tal, Thal valley (from Middle High German tal) (from Old High German) Weg way (from Middle High German wec, weg) (from Old High German weg wegh- in Indo-European roots)
From American Heritage Dictionary of the English Language, 5th Edition
- From 19th century German Thal (“valley") + Weg (“way, course")