Definitions for "Thalweg"
A line following the lowest part of a valley, whether under water or not.
The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles.
1. An imaginary line connecting the lowest points of a valley. 2. The line connecting the lowest points of a stream's channel. 3. The surface midline of a channel.
Keywords:  canyon, longitudinal, profile
The longitudinal profile of a canyon.