thalweg(redirected from thalwegs)
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The middle of the principal navigable waterway which serves as a boundary between two states.
A line connecting the lowest points along a stream bed or a valley. Also known as valley line.
A line crossing all contour lines on a land surface perpendicularly.
Water seeping through the ground below the surface in the same direction as a surface stream course.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.